Hi there, my husband and i just had a sexual interaction and i took an antibiotic last night. I am using microgynon 30 and just on my 1st week of my new pack.started saturday at 9:03pm then i was late taken my sunday pill for 5mins. Took my monday one on time but had taken just an antibiotic and that's it. Just one medicine. Having sex with my husband tonight brought me up a thought and worries that it might affect the effectivity of the pill and a possibility of being pregnant is present. If that, please tell me. Thank you so much!!