Early Period, Plan B, and Unprotected Sex.

Irene

So on October 26 I had unprotected sex. 5 days later meaning Dec 1 I took Plan B and couple hours I had unprotected sex and then he used a condom. Also my period is 1 week and 2 days early. My stomach was really soar and hurting before I got the early period. Is this sign something is wrong? Should I consult a doctor?