Could Tiredness And Cramps Be The Symptoms Of Pregnancy?

Hi i had unprotected sex about a month ago and i'm worried. I had a heavy normal period about a week later and everything seemed fine. but now i always have cramps, i'm tired a little more and my stomach grumbles a lot. i dont know if i'm over looking things, or if maybe i could be pregnant. he didn't ejaculate either. Could i be?