i had unprotected sex this past weekend, but he didnt actually go until we did it again on sunday afternoon. he said he pulled out in time but i figured i'd buy plan b anyways and we continued and he went 2 more times, also outside of my body. i took plan b an hour or two after having unprotected sex on sunday. i've been feeling kind of feverish and sick afterwards, probably cause my boyfriend was a bit sick before, but i went to the doctor yesterday and turns out i have strep throat. they prescribed me some antibiotics (TEVA-PENICILLIN VK) which i'm supposed to take 2 tablets, twice a day. i started taking them last night....will this affect the effectiveness of plan b?