I wouldn't be too concerned although blood is common its not normal...if yu are worried or start to bleed more I would contact yer doctor fir reassurance
I had spotting for about 2 weeks...unless its heavy bleeding I wouldn't be concerned. I'm 8 weeks now and my bleeding stopped around week 7
Same thing happen to me at 5w, had some spotting for 2 weeks now I'm 8w4d and it stopped at 7, my ob was a little bit concerned so he told me to take it easy, not to make any efforts, like lifting up heavy, shopping, no sex... So the best thing u can do is take a lot of care of urself and contact ur doctor...!!!! Best wishes!!!