I had unprotected sex a little over a month ago. I took a plan b and had a mostly normal period 2 weeks later. I thought i started my period again today. Cramped so bad i though i was going to throw up (which is normal for me) but i only had a blood clot come out today and normally i bleed super heavy. My boobs are also sore which doesnt really happen. Is there a chance I could be pregnant?