I am 23F, and I had sex for the first time. My bf used protection the whole time we did it but only once we did it without protection but he pulled out immediately and he didn't even have pre cum and he came a long time after that. My periods are quite irregular so I cant predict when I'll get my periods but according to the normal cycle I am on my 27th day and should get my period within a week. But I am very unsure if I should consider taking an emergency pill or not. Please help.