I’m late!

I was suppose to start my period today ladies... and usually I get horrible symptoms, such as: diarrhea, cramps that literally make me call off from work, and migraines, vomiting etc etc.... and well my breasts have been somewhat sore, I’ve been super sleepy, and for some reason I feel super super sad over everything. I’m not hungry at all either. My boyfriend and I have had unprotected sex since September and not once have I gotten pregnant. Has anyone ever had unprotected sex for a long period of time and ended up pregnant a long time after? When do I take a pregnant test? I want something accurate.