Please help!!

Me and my boyfriend have been having unprotected sex, but he has always pulled out and I'm about to start my period I'm liken3 days away but I haven't really experienced any symptoms just cramps all over my stomach and I've been really tired and lazy and very moody but I haven't had any nausea or any tender breasts I don't know if maybe my PMS isn't bad this time or if I may be pregnant So can u please help me it would mean the world to me