Pregnant or not?

So my boyfriend and I have sex without condoms but I’m on birth control. I just started using it right before we had sex. Because of my schedule I haven’t been able to take it at the same exact time. Anyways the 2nd week into the BC and I started bleeding. Like one day I would bleed and the next day I wouldn’t (two of the bleeding days I had to use a tampon). I’m on the last week now and it’s been two days but I haven’t started my period. There were a few days where I would get nauseous and hot but would never puke. I’ve also been battling depression. Do you think I’m pregnant?