I haf the same at 6 weeks and went for a scan. Everything was fine and will be for you as long as its not bright red blood x
Sounds like implantation of fetus in uterus.
Unless it's red blood, it should be fine. Also if it's only a little bit, it's nothing to worry about.
Check with your doctor ASAP it could be attributed to a number of things I wouldnt sit around go to the emergency room now the sooner they can intervene the better! I wish you the best of luck and i will say a prayer