I've been on birth control for 5 months now and have had unprotected sex with my boyfriend many times while on it. I've never experienced any problems, or scares, before. My period is unpredictable and I am never quite sure when I will be getting it. Last month it lasted for about 3 weeks so I don't know if I should be expecting it any time soon. Wednesday, April 6, was the last time my boyfriend and I had unprotected sex. Thursday, April 7, I stayed home sick from school with a sore throat and headache. I was supposed to start Bactrim that day, and was given one in the morning by my mom. Later in the day I realized that I had taken the antibiotic and that it decreases the effectiveness of birth control. I have not taken the antibiotic since, in fear that I could become pregnant. I am currently still sick with a cough, which is causing me abdominal pain so I am unsure if it is pain from the cough, or stomach pains that could mean pregnancy? Also, I started bleeding lightly the other day but sometimes it is a little heavier than spotting. I am unsure about all of this and was wondering if anyone could give me some insight. I plan on taking a test this Wednesday since it will be 2 weeks after the initial unprotected sec, but I have been stressing a lot lately.
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replied April 18th, 2011
Hello,

Welcome to ehealthforum

After the last episode of unprotected intercouse you took the antibiotic just once as explained by you so there is no possibility of pregnancy if you have been taking the pills before that regularly.Antibiotics decrease the efficacy of birth control pills and while on them it is advised to use extra protection.
It seems that you are having your menstrual bleeding.Since you are sick kindly take the prescribed medications as advised and if you have intercourse in between use the protection.
Relax yourself as you did not have intercourse while on taking antibiotic.If any symptoms worsen kindly see a Physician for evaluation.

Take Care!


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