IUI+D

Hello Dr. I got my period after 13 days of the second AID and 2 days before the estimated date of the cycle. Furthermore,i had a very very small blood spot around the 6-7 days since the insemination. Is it possible that i'm pregnant after all ? it's the first day of the period (the bleeding). Do i need to have the HCG blood test to make sure of it ? Thanks