A little confused... Help needed please~?

I got my period after my tww. A little depressing. But for some reason i feel like I am pregnant. I'm tired, but I cannot sleep at all! And I have constant hunger pains, and heart burn. I just have this feeling that Im pregnant. My question is, how common is it to have your AF come, yet still be pregnant? I can't test till tomorrow, so I am just trying to satisfy my curiousity today. Please help!