Had last period on 28th nov. had intercourse on 6th dec. am having heaviness in abdominal area and mild cramps on the left side of the abdomine. Can I be pregnant

Sure. Protection being used?

You won't know for sure until you've missed your period, that is the one true symptom that you can count on. If you haven't gotten your period within two weeks of when you should have, then you should take a test. Before that you can't really be sure.

Could be signs of many things, but there really no way to know at this early date. Only 10 days after sexual contact. You will need to wait and see if you miss this months period before testing