I had my last period nov 1, I am regular 28-30 days... this time, on my last period its heavy but lasted only to 2 and half day, I usually have 3-4 days. After my period is followed by light brownish discharge lasted to 2 weeks, headache, back pain, bloating, cramp legs, and hard to popo, breast now is erecting earlier.. until now is what I'm having. What I'm feeling right now? Am I pregnant? I had unprotected sex 1 week before my last period.

Of course you could be pregnant, "I had unprotected sex". Decidual bleeding is sometimes a sign of pregnancy. Visit your OB/GYN if you are that concerned or wait until your next expected period. However, consider some type of birth control.