Sunday my boyfriend and I had sex. I'm on the pill but no we didn't use a condom. By Wednesday(yesterday) I found out I had a kidney infection. I started taking my antibiotics today. I know that will effect my bc pill, so what I'm asking is, if I take plan b while on the antibiotics and my bc pill, will i still be able to be pregnant? I don't want to be. I have to take the antibiotics for seven days. Will plan b still work if I take it tomorrow? And would the days after plan b be baby free then too? Also, I take the pill consistently for systs so I don't have a period. I've taken them for three years.