The best time to start preparing for pregnancy is about three months before you begin trying to conceive. That window gives your body time to build up essential nutrients, clear out harmful substances, and address any health issues that could complicate conception or early pregnancy. Some steps, like stopping certain medications, may need even more lead time. Here’s what to focus on.
Schedule a Preconception Checkup
A preconception visit is different from a regular physical. Your doctor will screen for conditions that could affect your ability to get pregnant or harm a developing baby early on, sometimes before you even know you’re pregnant. Blood tests typically check for rubella immunity, since getting rubella during pregnancy can cause serious harm to the fetus. If you’re not immune, you’ll need a vaccine before conceiving. Your provider will also screen for sexually transmitted infections like chlamydia, gonorrhea, syphilis, and HIV, all of which can impair fertility and pose risks during pregnancy.
Depending on your family background, your doctor may recommend genetic carrier screening. A simple blood or saliva test can reveal whether you or your partner carry genes for conditions like cystic fibrosis, sickle cell disease, or Fragile X syndrome. You won’t necessarily need this, but it’s worth discussing if either family has a history of inherited conditions. Additional tests for anemia or hepatitis may also be recommended based on your individual risk factors.
Review Your Medications
Some common medications are unsafe during pregnancy and need to be stopped well before you start trying. Isotretinoin, widely prescribed for severe acne, should be discontinued at least four weeks before conception. A related drug, acitretin, takes much longer to clear your system, and pregnancy should be avoided for two years after stopping it. Methotrexate, used for autoimmune conditions and certain cancers, needs to be stopped at least three months before conception, with high-dose folic acid supplementation during that time.
The general principle: if you take any medication regularly for a chronic condition, talk to your doctor about adjusting your regimen before you start trying. This includes over-the-counter drugs and supplements. Your provider can help you find safer alternatives or adjust doses so you’re not caught off guard.
Start Folic Acid Early
The CDC recommends all women capable of becoming pregnant take 400 micrograms of folic acid daily. This B vitamin plays a critical role in preventing major birth defects of the brain and spine, and these structures form very early in pregnancy, often before a missed period. Starting folic acid at least one month before conception is the minimum, but three months is better.
Beyond folic acid, several other nutrients support fertility and early pregnancy. Folate, iron, and vitamin D all contribute to a healthy uterine lining, which is essential for implantation. Omega-3 fatty acids help regulate reproductive hormones, improve egg quality, and support embryo implantation. Research from large preconception studies in Denmark and North America found that women with low omega-3 intake and high trans-fat intake had reduced chances of conceiving in any given cycle. You can get omega-3s from fatty fish, walnuts, and flaxseed, or from a supplement if your diet falls short.
Reach a Healthy Weight
A BMI between 18.5 and 24.9 is considered the optimal range for conception. Moving toward that range, in either direction, meaningfully improves your odds.
The data on excess weight is striking. Women with a BMI above 27 are roughly 2.4 times more likely to experience infertility related to irregular or absent ovulation compared to women at a normal weight. As BMI rises, implantation rates and live birth rates during fertility treatments drop in a linear pattern. Obesity also increases the risk of miscarriage: women with obesity are about 1.3 to 1.5 times more likely to lose a pregnancy than women at a healthy weight.
Being underweight (BMI below 18.5) carries its own risks, including disrupted menstrual cycles and increased likelihood of other health complications. If you’re significantly above or below the healthy range, even modest changes of 5 to 10 percent of your body weight can improve hormonal balance and ovulation regularity.
Adjust Alcohol and Caffeine
Heavy drinking clearly impairs fertility. Women who consume more than seven alcoholic drinks per week are about 7% less likely to conceive compared to non-drinkers. That may sound modest, but compounded over months of trying, it adds up. The safest approach is to cut alcohol entirely once you’re actively trying, since you won’t know the exact moment of conception and alcohol poses risks in the earliest days of pregnancy.
Caffeine, on the other hand, appears to be less of a concern than many people assume. A large analysis found that caffeine consumption by either partner didn’t affect the odds of pregnancy or live birth. Moderate intake, roughly one to two cups of coffee per day, is generally considered fine during the preconception period.
Your Partner’s Health Matters Too
Sperm take about 74 days to fully mature, which means any lifestyle change a male partner makes today won’t show up in sperm quality for roughly two and a half to three months. That’s why the three-month preparation window applies to both of you.
The basics for sperm health mirror general cardiovascular health: a balanced diet, regular moderate exercise, maintaining a healthy weight, and avoiding tobacco and marijuana. Excessive heat can also impair sperm production. Hot tubs, saunas, and even resting a laptop directly on the lap can raise testicular temperature enough to affect sperm count and quality. Placing a pillow or book between the laptop and the body is a simple fix.
One counterintuitive risk: testosterone supplements. Men sometimes take these for low energy or decreased sex drive, but supplemental testosterone can actually suppress the body’s own sperm production. If your partner is using testosterone therapy, he should speak with a doctor before you start trying to conceive.
Understand Your Fertile Window
Ovulation typically happens about 14 days before the start of your next period. But the window where conception is possible is wider than that single day. Sperm can survive in the body for up to five days, and an egg remains viable for 12 to 24 hours after ovulation. That creates a roughly six-day fertile window each cycle: the five days before ovulation and the day of ovulation itself.
For the best chance of conceiving, having sex every day or every other day during this window is what research supports. You can track ovulation using basal body temperature, ovulation predictor kits that detect a hormone surge in your urine, or apps that help you monitor cycle patterns. If your periods are irregular, ovulation predictor kits tend to be more reliable than calendar-based estimates.
Reduce Environmental Exposures
Certain chemicals in the home and workplace can interfere with fertility for both women and men. Hormonally active agents, substances that mimic or disrupt reproductive hormones, are the primary concern. These include some pesticides, solvents, and chemicals found in plastics. If either partner works in agriculture, manufacturing, or cleaning industries, it’s worth reviewing workplace exposures with a healthcare provider.
Cigarette smoking is one of the most well-documented fertility reducers. Women who smoke have decreased fertility, and smoking also damages sperm quality in men. Quitting at least three months before trying gives your body enough time to recover, aligning with the sperm regeneration cycle for male partners.
Know When to Seek Help
Age is the single most important factor in determining your chances of conception, and the timelines for seeking specialist help reflect that. If you’re under 35 and have been trying for 12 months without success, it’s time to see a fertility specialist. At 35 to 40, that window shortens to six months. Over 40, three months of trying without conceiving warrants an evaluation. These aren’t arbitrary cutoffs. Egg quality and quantity decline with age, and earlier evaluation means more treatment options remain available.