I had protected sex i got my period but my period was irregular, it started off light then heavy for two days and light again ,can i be pregnant ?

Not likely: If you have a period, you are unlikely to be pregnant. Periods can sometimes have heavy and light days. A home pregnancy test might ease your mind if you are worried. Best wishes!

Check a test: A pregnancy test would be positive at this point if you were, so check one.

Pregnancy: If you are healthy and have sex without optimal protection you are always at risk of becoming pregnant. No contraceptive option is fool proof except abstinence. Why wonder? Do a pregnancy test. They are very sensitive and turn positive extremely early in pregnancy. If you still wonder, repeat in one-two weeks and your answer will be as sure as is possible without going to see MD.