bleeding but dont know why help

Nikedra

I have been bleeding red blood for 3 days I when to my doctor and we took test and she told me she was worried about it she told me if I have any pain to call but I feel fine tbh no pain just bleeding but it's not heavy it's in between I still have slight sore boobs and low back pain but not bad can one of y'all please tell have one of y'all had this I'm 5 weeks and 5 days with my 2 pregnancy