Me and my boyfriend had unprotected sex 3 times.. A week or so later I got my period a couple days early , it was normal nothing wrong.. A few days after it ended when I whipped it was pink.. Now that has stopped and I'm just having BAD cramps , heart burn , pains in my lower back && sides and from time to time I feel like I'm going to faint.. can I be pregnant?

If you are having unprotected sex there is ALWAYS a possibility of pregnancy. However, you did have a regular period. This does not always mean you are not pregnant though.

When was your period? When is your next one due? The symptoms you describe usually happen later in pregnancy, particularly late second/early third trimester, aside from the dizziness.

Unfortunately you are now playing the waiting game and must wait until your next expected period.