If the blood is bright red and you're worried I would give your doc a call just to be safe
If your worried Hun, go get checked. It doesn't hurt to get told everything's ok :-)
I did in my 4th week and 9th week. I was told in my fifth that it was still from implantation. And my 9th was some old blood and it was around the time I should have gotten my period
I was spotting for a while at 8 weeks at first I was a little scared but later learned it was implantation. long as it's not bleeding like a period you should be fine. hope all is well tho!