"i had unprotected sex while on my birth control pills not realizing that the anti biotic i am on would counteract with it considering it usually says it on the bottle. however, after i started panicking the very next morning (less than 24 hours) i went and bought the plan b pill from my local drug store for 50$. i did not feel anything after taking it but 24 hours afterwards i felt nauseous, and my stomach felt upset. after that passed, my period was supposed to come 3 weeks later it....my breasts became very sore, and i broke out really bad. all symptoms of my period. so 4 days before my period was supposed to start i got my period!!! i was ovulating, and over the &quot;weight limit&quot; be patient and wait!"