Period late?? TMI

Hello guys. So I was supposed to start my period on the 30th but this is all that's happened. My boyfriend and I had unprotected sex about 3 weeks ago. He pulled out and did not cum inside of me. About 2 weeks ago we had sex with a condom as well. I was getting pms symptoms (slight cramps, and extremely tender nipples) but I still have yet to start my period. I had sex with my boyfriend this morning and it usually triggers my period to start but still nothing just this? Should I take a test? I told my boyfriend about it and he said that he thinks it's not possible.. Any advice would help right now.