Dr Last 2 Weeks I Had Period Pains An I

Dr last 2 weeks I had period pains an I did see my period an only for 2 days softer having unprotected sex. And buy that time I last used depo on the 16april. So after a week an a half I have same pains an now they though my weist and its 3days now. Is it possible that I'm pregnant? . Becouse I never had my period it was 1tym an they only took 2 days