i’m on my period, i’ve been on birth control for about a month now (i’m sure it’s not as effective yet as it would be), and we just had sex but when we were done the condom stayed inside and i had to take it out. i know there is always a chance of pregnancy when you have sex, but is it likely that i could be pregnant? should i try to get plan b? to get that do i just go to a pharmacy and ask for it?