M.P.
This is really a question you need to ask your doctor and pharmacist.
You can google each of your medications and see if the site talks about the possibility of birth defects.
I suggest it's unlikely that you're pregnant. It's more likely if there was a break of several weeks between the end of the 3 months on depo and the beginning of the pill.
I also suggest, based on my daughter's experience, that it's good that you're using birth control. You want to be established as an adult, with a good income and stable relationship. Keeping condoms on the floor isn't a good sign of stability. Just saying.
My daughter had a baby at 20 and 23. She now has one at 30 and says she's much better able to provide for this baby both financially and emotionally.