Pregnancy?

Okay, so about 2 years ago I got the arm implant birth control and it messed up my periods so bad that after a year and a half of the arm implant I took it out and started depo. Through this whole time I bled every single day and never knew when my period was. I got the deposit shot in August and was supposed to get it again in November but I didn't because it was making me bleed even more. So I was switching to the pill and ended up not taking it for awhile per doctors orders and still bled this whole time. I had unprotected sex on a Thursday and Friday I all but stopped bleeding. I started my pill Friday and it's now Monday and I'm not bleeding at all. Could I be pregnant?