Am I pregnant ??

I had sex on October 17 2 weeks later I was having a lot of headaches, cramps, heartburn back pain my boobs where hurting and in the morning when I wake up they were heavy 5 in the morning on Saturday my left hips started hurting. My period was supposed to come November 4th but I was 3 days late and it came the 7th when I first came it was like spotting brown and then when I went to the bathroom to pee and I whipped it was heavy dark blood but it had blood clots could it be pregnancy or it’s just my period?? If im pregnant right now I’m 4 weeks, 4 days