I had unprotected sex with ejaculation and everything then took the pill, which resulted in the spotting that is meant to happen when the MAP is taken. During the next 2 weeks I had unprotected sex again but with no ejaculation and now am having very light brownish bleeding. Its been going for almost two days now and am really worried, but am getting back and period pain which I took care of with period pain tablets.
Could I be pregnant?

Any time you have sex you can get pregnant. If you are not wanting to get pregnant, at the very least, you need to use some form of protection.