Late?

I recently got off of birth control back in January. I've had normal periods since I got off. But March was different. I had a period March 3rd and lasted for 5 days then I had another period March 21st. And last 5 days. And now it's April and I haven't started my period yet and my boyfriend and I have had a lot of unprotected sex. Could I be pregnant or is it not time for my period?