My period was supposed to start today but it didn't. Yesterday I had sex with my bf without protection but he took it out before finishing,But I'm not sure I'm I might be pregnant or not because I am not always regular with my period and it's only been  a day that I'm late. I don't know whether to take the morning after pill or not, we'll the one that you can take until 72 hours after sex, what do you think I should do?