Pregnant & on B/C Pill...

So ladies I think I may need some help/advice I'm going to be starting my period in about a week or so. And I have been cramping headaches on and off this past week. I've been tired every day. Feeling sluggish and bloated. Felt nauseated yesterday morning. And all these symptoms I normally don't get before I'm going to start my period so it does raise a flag for me. So do you think I can be pregnant.? I've been on the pill for about 8-9 months now I'm taking Ortho Tri-Cyclen Lo. I was on the IUD but got it taken out due to mild implantation in my uterus. But I just read that alcohol plays a roll and not taking them everyday at the same time has a roll in affecting the pill as well. I'm just asking because hubby keeps on asking and now I'm just curious.