I got my period three days ago an im just now noticeing blood clots there not to big there small but it worries me could I be pregnant but miscarryn?

Maybe. Have you been doing anything that might result in pregnancy? You know - having sex? If so, then you could if your period is dramatically different. Talk to your doctor.
Hard to say. Unfortunately it is impossible to know without a urine and possibly blood test. I advise visiting your doctor.