I had unprotected sex and then a few hours later started my period. I bleed for two days and it stopped. My period have been coming a week early every month so I'm not really sure when ovulation is.. Could I be pregnant..

Have I got this right? You had sex, you got your period, you wonder if you're pregnant?

Do you understand how pregnancy "works?" Here's a good source: Pregnancy - Information, Tools & Timeline | BabyCenter (http://www.babycenter.com/pregnancy)

Ovulation varies, and you can not go by exactly when period starts.
You have to tract it with body temp or other testing to really know.

The other issue is that pregnancy can happen any day, there is just better chances on some days.

So yes of course you could be pregnant, no way to tell at this point, will need to wait and see if the period comes and if no period by next month, you test then