My boyfriend and I started having sex about 12 days ago on and off without protection. Although he always pulled out. But on Sunday morning I started my period and it ended on Tuesday night so it was about two days which is not normal for me since I go about a week or so. Could I be pregnant?

Of course, you are having unprotected sex. ( pulling out is not a birth control method) there are plenty of sperm in all that early fluid to get your pregnant.

Why are you not using some form of birth control if you did not want to get pregnant