Signs?

The past 2 weeks I have been having sex and when he would cum itd be like on my ass and it always drips down into my vagina. I've had really bad cramping on my lower left side of my stomach,feel like puking when I eat but i am hungry constantly, and super tired the past 3 days I've been napping and I usually dont nap and have been having really bad gas. My period is supposed to have come a couple days ago but some times its late so idk what to do cause I feel like it would be too early for a urine test to pick it up but to embarrassed to ask my doctor for a blood test he runs a test almost every time I go in.