ADVICE???

I thought I had a natural MC 4 weeks ago, I have been doing opks to try and judge when my period would start as if I am ovulating then I would know when my period is due. But I kept getting positives so I thought maybe left over hormones so I did a pregnancy test exspecting it to be a faint positive but NO!! It's darker then when I found out I was pregnent. I was 5 weeks when the heavy bleeding stated. This is the test what do you ladies think?! I didn't do a test after the bleeding or go doctors as my head was all over the place after thinking this was my 3rd MC this year