Missed Period on Pill

I've been taking the pill for over a year and half. I am almost always on time taking it, and whenever I have sex with my boyfriend he pulls out. Last week was suppose to be when I got my period (On Tuesday) but never did, but I did have cramps. I've missed my period before even before I went on the pill from stress, so that's most likely it but with my overthinking I still have that worry I'm pregnant. Any advice