If you had unprotected sex about a week ago, you likely still have options to prevent pregnancy, and the specific option depends on whether fertilization and implantation have actually occurred. At this stage, emergency contraception may still work, and if pregnancy has already begun, medication abortion is highly effective in very early pregnancy. Here’s what you need to know about timing, your body, and what’s available.
What “One Week” Actually Means
The first thing to sort out is what you mean by “a week.” If it has been roughly seven days since you had unprotected sex, that’s different from being one week pregnant in clinical terms. Doctors count pregnancy from the first day of your last menstrual period, not from the day you had sex. So someone who is “four weeks pregnant” by medical dating actually conceived about two weeks ago. This distinction matters because it affects which options apply to you.
If you had unprotected sex within the past five days (120 hours), you may not be pregnant yet, and emergency contraception can still prevent pregnancy from starting. If it has been longer than five days, implantation may have already occurred, and you’d be looking at very early pregnancy options instead.
Emergency Contraception: Up to 5 Days After Sex
Emergency contraception works by delaying or preventing ovulation, so a sperm and egg never meet. It does not end an existing pregnancy. There are two main pill options and one device option, each with different effectiveness windows.
- Levonorgestrel pills (Plan B One-Step and generics): Available over the counter without a prescription. These work best within 72 hours (three days) of unprotected sex but can still have some effect up to 120 hours (five days). Effectiveness drops significantly after the three-day mark.
- Ulipristal acetate (ella): Requires a prescription. This pill maintains its effectiveness across the full five-day window better than levonorgestrel does. If you’re closer to the four- or five-day mark, this is the stronger option.
- Copper IUD: When inserted by a healthcare provider within five days of unprotected sex, a copper IUD is more than 99% effective at preventing pregnancy. This is the most effective form of emergency contraception available, and it doubles as long-term birth control for up to 10 years.
For all of these, sooner is better. If you’re within that five-day window, act today rather than tomorrow.
How to Know If You’re Actually Pregnant
If it has been more than five days since unprotected sex, emergency contraception is no longer an option, and the next step is finding out whether you’re pregnant. A fertilized egg typically implants into the uterine lining 10 to 14 days after ovulation. Until implantation happens, you are not technically pregnant, and no test can detect it.
Home urine pregnancy tests detect the hormone hCG and generally become reliable around the first week of a missed period. They need hCG levels to reach about 20 to 25 IU/L to show a positive result. A blood test at a clinic is more sensitive (detecting levels below 10 IU/L) and can pick up pregnancy two to four days earlier than a urine test. If you’re testing very early, use your first morning urine for the most concentrated sample.
You might also notice implantation bleeding, which looks like very light pink or brown spotting lasting a few hours to about two days. It’s much lighter than a period, doesn’t involve clots, and any cramping with it feels milder than menstrual cramps. If your bleeding is heavy, bright red, or contains clots, that’s more likely your period arriving normally.
Medication Abortion in Very Early Pregnancy
If a pregnancy test confirms you’re pregnant and you want to end the pregnancy, medication abortion is approved for use up to 70 days (10 weeks) from the first day of your last menstrual period. At very early stages, it is extremely effective. The process uses two medications taken at different times: the first blocks the hormone needed to sustain the pregnancy, and the second, taken 24 to 48 hours later, causes the uterus to empty.
Success rates are highest in the earliest weeks. In a large study tracking outcomes by gestational week, the success rate was 99.3% at week four (days 28 to 34 from the last period), 98.8% at week five, and 98.1% at week six. These are among the highest success rates of any medical procedure.
The experience involves heavier bleeding than a normal period, often with significant cramping. Common side effects from the second medication include nausea (43 to 66% of people), vomiting (23 to 40%), diarrhea (23 to 35%), dizziness (28 to 39%), and chills or hot flushes (32 to 69%). These effects are temporary. For most people, the worst pain lasts no longer than 24 hours. Over-the-counter anti-inflammatory pain relievers like ibuprofen are the recommended approach for managing discomfort. A sign to seek urgent care is soaking through more than two maxi pads per hour for two consecutive hours.
How to Access Medication Abortion
Federal regulations allow the abortion medication to be prescribed through telehealth and mailed directly to patients. In-person dispensing is no longer required under FDA rules updated in 2023. Certified pharmacies can fill the prescription, and non-physician clinicians can prescribe it. This means many people can complete the process from home after a virtual consultation.
However, access varies significantly by state. At least nine states, including Texas, Florida, Indiana, Kentucky, Arkansas, Oklahoma, South Carolina, Arizona, and West Virginia, explicitly ban the use of telehealth for medication abortion or prohibit mailing the drugs. Laws continue to shift, so checking your state’s current rules is essential. Organizations like Plan C and the National Abortion Federation maintain updated directories of available services by location.
Procedural Abortion at Very Early Stages
Some providers offer a vacuum aspiration procedure as early as a few weeks into pregnancy, though many prefer to wait until at least five to six weeks so the pregnancy can be confirmed on ultrasound and fully removed. The procedure takes only a few minutes and uses gentle suction. Complication rates are low, around 2% for significant issues. It is equally safe whether performed with a manual or electric device. Recovery is typically quick, with most people resuming normal activities within a day or two.
Not all clinics offer procedures this early. If you’re very early in pregnancy and want a procedural option, you may need to call ahead to confirm the clinic’s earliest scheduling window.
Timing Is the Most Important Factor
Whatever path you’re considering, the single most important variable is time. Emergency contraception becomes less effective with every passing hour. Medication abortion has higher success rates at earlier gestational ages. And access to care can involve scheduling delays, especially in states with restrictions. If you’re within five days of unprotected sex, getting emergency contraception today gives you the best chance of preventing pregnancy entirely. If you’re past that window, taking a pregnancy test at the right time and exploring your options promptly keeps the most doors open.