Could Cramps And Brown Discharge After Intercourse Indicate Pregnancy?

I had unprotected sex for the first time on December 28th. I woke up with my period the next morning. It continued for the next two days or so; which is normal because my periods lasts about three days. I still had slight cramps, not as bad as usual and my flow wasn't as heavy as a my usual period, but I didn't think much of it. When my period stopped, I had sex again on January first through the fourth, all unprotected. I didn't think much of anything until I started getting period like cramps and noticed I had brown discharge yesterday, the eleventh. I realized my cycle is about 26 days, so my first fertile day of this month was on the sixth; which was when I had the normal white discharge. But since yesterday, I've basically felt like I do when I'm on my period (bloated, emotional, cramping, etc.), except instead of normal blood, I have brown discharge. Could I possibly be pregnant?