My ex and I had unprotected sex a week before my period. At first my period was irregular spotting which turned into light and then heavy and ended up with spots my period was 5 days long however 2 weeks later I'm finding myself dizzy bad headaches and very very hungry can I be pregnant?

As with any case of unprotected sex, yes you could be pregnant.

If you're really worried you should take a pregnancy test (if enough time has passed) or see a doctor to have one performed.