Talk to Gynecologist on Miscarriage

A o.A . Last month I had a miscarriage at 8 weeks on 10 July . Sac was not seen during ultrasound but after 2 days of bleeding a small piece was discharged out during bleeding. And bleeding was stopped after 4 days.This month period did not come and on 10 August of this month I did pregnancy test again and it became faint positive. Yesterday I had pinkish spotting but today I have watery red discharge but not on panty..... only seen during wiped... with no any smell and I did pregnancy test again and it become negative. What should I do ?? AM I pregnant or not and y it was shown positive and again negative after 2 days and having redish discharge