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Q: What are the chances of pregnancy after taking Plan B and starting birth control pills?

  • Myeongchan Kim
  • Sep 17, 2025
  • 2 min read

This post is a dramatization of a question and answer session experienced by our actual medical reviewers. Please note that this content is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.



Question: I'm a mother with a history of anxiety and am trying to understand my risk of pregnancy after a complicated series of events. I'd appreciate some insight.

Here is my timeline: * Day 1 of cycle: My period started. * Day 5: I had my Mirena IUD removed after having it for one year. * Day 8: I had unprotected sex and took a Plan B pill about an hour later. * Day 9: I started taking oral birth control pills. * Day 13: I had unprotected sex again. An ovulation test I took looked almost positive, so I tested frequently and confirmed an ovulation peak, which then decreased the next day. * Day 14: I stopped taking the birth control pills, worried that if I did conceive, the pills could harm the pregnancy.

I am now 9 days past ovulation (DPO) and have been testing twice a day with early-result pregnancy tests, but all have been negative. With my previous pregnancies, I always got a faint positive result by 9 DPO. Should I stop testing and assume I'm not pregnant? I'm confused about why I would have ovulated after taking Plan B and starting birth control pills.


Answer: Honestly, it's hard to give exact odds because of all the variables: - Plan B reduces risk but isn't foolproof, especially if ovulation was already close. - The birth control pills likely weren't in your system long enough consistently to prevent ovulation or pregnancy. - Mirena removal can also mean your body is trying to get back to its natural cycle. - Zoloft: Generally, Zoloft doesn't interfere with Plan B effectiveness or pregnancy test accuracy.

So, do test again in a few days if your period doesn't start. hCG levels roughly double every 48-72 hours in early pregnancy. If your period is late or you get a positive test, definitely see your doctor to discuss everything, especially since you stopped the birth control pills due to pregnancy concerns. They can confirm and provide guidance.

It's a waiting game right now, which is tough with anxiety. Try to hang in there. Keep testing as you planned and touch base with your doctor.



For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.






 
 
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