Hi I am 18 years old. I had unprotected sex on the last Sunday of January the sex lasted only like 2-4 minutes max but off and on nothing serious. but I started spotting the following Monday and started heavy bleeding for 2-3 days and I am still bleeding and it’s feb 2nd is it my period? I got acne, constipation, cramps, all the symptoms of my period. Idk what’s going on should I be worried that I can be pregnant