Pregnancy or Period??

teresa

My “period” came 2 weeks earlier and only lasted 2 1/2 days. It normally lasts 4, it was heavy the first day then got light. It was normally light at first. My cramps were kinda bad and my right side and back hurts. And I’ve felt a lil nauseous. Could I be pregnant and this he implantation bleeding? Has this happened to anyone?