Preparing your body for pregnancy ideally starts at least three months before you stop using contraception. That window gives you time to build up nutrient stores, update vaccinations, review medications, and address any health conditions that could affect conception or a developing baby. Here’s what to prioritize.
Start Folic Acid Early
The CDC recommends all women capable of becoming pregnant take 400 micrograms of folic acid daily. This B vitamin helps prevent major birth defects of the brain and spine, but it needs to be in your system before and during the earliest weeks of pregnancy, often before you even know you’re pregnant. A standard prenatal vitamin covers this amount, so switching from a regular multivitamin to a prenatal is one of the simplest first steps you can take.
Schedule a Preconception Checkup
A dedicated preconception visit is different from a routine annual exam. Your provider will review your medical history, screen for sexually transmitted infections if needed, check your vaccination status, and discuss any chronic conditions that could complicate pregnancy. This is also the time to ask about carrier screening, a blood test that checks whether you carry genes for conditions like cystic fibrosis, sickle cell disease, or Tay-Sachs disease. If both you and your partner carry the same recessive gene, your baby could be at risk. Knowing this ahead of time gives you options.
If you have a chronic condition like diabetes, getting it well controlled before conception matters significantly. Guidelines from the UK’s National Institute for Health and Care Excellence recommend an HbA1c (a measure of average blood sugar over the past few months) below 6.5% before getting pregnant. If that number is above 10%, the risk of serious complications rises enough that most care teams will strongly advise waiting until blood sugar improves. Conditions like high blood pressure and thyroid disorders also benefit from optimization before pregnancy.
Review Your Medications
Some common prescription medications can cause serious harm to a developing baby, and several need to be stopped or switched well before conception. The seizure medication valproate, for instance, is linked to spinal cord defects and developmental delays. Other seizure drugs like carbamazepine and phenytoin carry their own risks. Warfarin, a blood thinner, can cause skeletal abnormalities, particularly during weeks six through nine of pregnancy. Certain antibiotics, including tetracyclines and a class of drugs often prescribed for urinary tract infections, are also unsafe during pregnancy.
The key point: don’t stop any medication on your own. Bring a complete list of everything you take, including over-the-counter drugs, to your preconception appointment. Your provider can identify which ones need to be swapped for safer alternatives and build a timeline for making the switch.
Get Your Vaccinations Up to Date
Rubella (German measles) during pregnancy can cause devastating birth defects, and the vaccine that protects against it, the MMR shot, can’t be given during pregnancy. If a blood test shows you’re not immune, you’ll need the vaccine before conceiving and should wait at least one month afterward before trying. Your provider may also recommend hepatitis B screening, since a mother with hepatitis B can pass the virus to her baby during delivery. Hepatitis A vaccination may be suggested if you have chronic liver disease.
Work Toward a Healthy Weight
Body weight has a measurable effect on how quickly you conceive and how the pregnancy goes. A large study published in JAMA Network Open found that women with obesity had 28% lower monthly odds of conceiving compared to women in the normal BMI range of 18.5 to 24.9. Being underweight nearly doubled the odds of subfertility. Both overweight and obesity were also associated with roughly 44 to 49% higher odds of miscarriage.
You don’t need to hit a perfect number on the scale, but even modest weight changes in either direction can improve your chances. Crash dieting isn’t the goal. Focus on consistent, sustainable habits: regular physical activity, balanced meals, and enough calories to support your body without excess.
Your Partner’s Health Matters Too
Preconception preparation isn’t just for the person who will be pregnant. Male partner BMI affects fertility as well. The same JAMA study found that obesity in men was associated with 69% higher odds of subfertility. For every single-point increase in a man’s BMI, the monthly chance of conception dropped slightly.
Beyond weight, the lifestyle recommendations are similar: quit smoking, reduce alcohol, eat well, exercise regularly, and manage stress. Men who work with chemicals, pesticides, or heavy metals should talk to a doctor about minimizing exposure, since environmental toxins can damage sperm quality. Any chronic conditions like diabetes or thyroid disorders should be well managed, and medications should be reviewed for potential effects on fertility.
Cut Back on Caffeine and Alcohol
The European Food Safety Authority recommends women trying to conceive keep caffeine intake below 200 mg per day, roughly one 12-ounce cup of brewed coffee. The World Health Organization sets a slightly more generous limit of 300 mg. Staying at or below 200 mg is a reasonable target that carries over into pregnancy.
Alcohol has no established safe level during pregnancy, so many providers suggest cutting back or stopping entirely once you start trying. Since you won’t know you’re pregnant for the first few weeks, reducing alcohol during the trying-to-conceive phase eliminates the risk of early exposure.
Learn Your Fertile Window
Understanding when you ovulate helps you time intercourse effectively. You have a few tools to work with, and they differ in reliability.
- Ovulation test strips detect a hormone surge in your urine that typically occurs about 20 hours before the egg is released. A Cochrane review of over 1,300 women found that timing intercourse using these strips increased pregnancy rates by 36% compared to not tracking. They’re inexpensive, widely available, and the most reliable at-home method.
- Cervical mucus monitoring involves watching for slippery, stretchy discharge that resembles raw egg whites, which signals your most fertile days. Studies show this method correlates with actual ovulation about 48 to 74% of the time, depending on how it’s assessed. It works best as a secondary signal alongside test strips.
- Basal body temperature tracking involves taking your temperature every morning before getting out of bed. A small rise confirms ovulation already happened. The problem is that it tells you after the fact. One study found that temperature-based timing matched the actual day of ovulation only 22% of the time. Most experts no longer recommend it as a primary method for couples trying to conceive.
Build Healthy Habits Now
Pregnancy puts significant demands on your body, and starting from a strong baseline makes a difference. If you smoke, quitting before conception protects both your fertility and the baby’s development. If you’re sedentary, building a regular exercise routine now means you’ll have one in place when pregnancy fatigue hits. Focus on whole foods, especially leafy greens, lean protein, and iron-rich options, since your nutrient needs will increase substantially once you’re pregnant.
Think of the preconception period as a three-month runway. Sperm take about 72 days to mature, eggs are influenced by your hormonal environment in the months before ovulation, and many of the protective steps above, like building folic acid stores or reaching a target blood sugar level, need time to take effect. Starting early gives you the best foundation for a healthy pregnancy.