since I new I'm pregnant there was that light spotting, last Monday i had a light bleeding, by Tuesday and Wednesday it was very heavy, so I had a curettage on Thursday, by that time the doctor didn't mention the anti d injection though my blood is A negative, so I called him by Friday morning and he said that I can take it by Saturday since I was only 4 to 5 weeks pregnant, I already took it, but still I feel that I might be late since the heavy bleeding started Tuesday