Miscarriage - Bleeding for 4 weeks & faintly positive pregnancy test

I miscarried very early on at about 5 weeks, confirmed by doctor when my HCG fell from 105 - 80 ul/l which was very low to begin with. However I’ve been bleeding & spotting on and off for over 4 weeks and my home pregnancy tests are still coming up as faintly positive. Is this normal? And when is it ok for us to start trying again? #miscarriage