Help!

This is the first time I have birth control, so I have the copper IUD. I already had my first period on it. The thing is that I had one in between bleeding last friday like it was pretty heavy way more than spotting. TMI but I even stained my underwear and I only had a regular tampon so thats what I used and I also leaked through that one & it had a lot of uterine lining. Now today im 2 days late. I have no symptoms and the times I had intercourse I used condoms. Only last Sunday I used the pull out but it was already 5 days before my period was due. Could I possibly be pregnant? I also came down with the flu 2 weeks ago so im not sure if that could play a part on why im late or do I have a possibility of being pregnant?