Am i pregnant :(

I'm really scared I could be pregnant bc my boyfriend and I have had unprotected sex a few times but he always pulls out way earlier than he needs to and he does that with a condom as well. My period is 6 days late and I have irregular periods. My cycle used to be at the end of the month then the middle and now the beginning so could I just be switching cycles? My period being this late has happened before and I wouldn't get it till the end of the month but I'm still very nervous. I'm not on bc or anything because my mother doesn't approve of it :(