I broke my leg at the beginning of this month at the end of my period, recently my incision from my surgery became infected and I was put on bactrim DS. I have taken tri-Lo sprinter for 2 years now. I completely forgot that antibiotics effect birth control and had sex on Wednesday of last week. Also last week, Tuesday-Saturday I had spotting. But it was heavier than what I have read about and a bright red color like my normal period. I did not begin taking my antibiotics until Thursday night. Yesterday, Monday, I realized that antibiotics and bc pills interact so I took a Plan B even because certain websites said that it COULD work up to 5 days and I thought it was worth a shot. My question is, do you think I'm pregnant? Or is the bleeding just from stress? And do u think taking plan B helped?
Birth control (BC) pills work, to some degree, for an extended period of time because they have built up in your system to prepare your body not to become pregnant by stopping ovulation and making the uterine lining inhospitable to a fertilized egg so it passes through. As for your unusually heavy blooding, it definitely could have just been caused by the antibiotics making your BC pills less effective (according to manufacturers) however, because you were on BC for a period of time before you began taking the antibiotics it is unlikely you became pregnant (though not impossible) because it generally takes time for your body time to adjust after stopping BC pills or for the antibiotics to interfere enough that your body most likely was not prepared to ovulate or host a fertilized egg. You took the Plan B as a backup, it could have helped, given your body was already not best prepared to host a pregnancy due to the birth control pills, so it is possible that it helped and you probably aren't pregnant, but only a test could tell for sure. Unless your Doctor or BC pill manufacturer recommends otherwise, I would keep using a backup birth control method after you stop taking the antibiotics, for as long as the manufacturer recommended when you first started your taking your BC pills before they were effective.
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