Miscarrige! Been Bleeding for 2 weeks 2 days!?

Im currently going threw a miscarrige and have been bleeding for 2wks 2days & at first it was light then it got very heavy! Now its only when I wipe and a little spotting ! But it smells gross! How will I know if I have an infection? I was told today by my doc to come back in 1 week to see how the bleeding is, & theyve been chking my HCG levels. Im concerned about bleeding still && about the smell Im afraid for infection. what are some things to look out for if an infection occurs? will the blood be heavy in an infection?