oilchick

I'm a 21 year old. I don't know what's been going on with me this last month and I don't know if I'm looking too much into it or not enough. I have been looking at other forums but no one quite has the same thing going on as me. So here I go I will share with all of you in hopes of some advice.
My last period was on April 28th. It lasted its regular 4-5 days, nothing different about it. When it was done I was clear for 2 days then light bleeding started occurring. It was just enough to show on the toilet paper when I wipe. I bled through the whole month of may (to current) the first week was a light brown, second week a combo of light pink and brown and just gradually kept getting darker. But consistently light amounts came out during this whole time.
On may 25th I decided to take a home pregnancy test. It came out positive. I decided to take it because I figured if I could eliminate pregnancy then I could go to the Dr and tell them all that I figured out and get them to do other tests to try and figure out what's going on. But at the same time I wanted to wait till after my menstrual cycle would be due for the month of May. Which I have a period that will show up anywhere within every 28-32 days so I never know exactly when to get it. On May 28th throughout the day I had 3 pea sized clots pass. I figured that if I was pregnant, that I'm not anymore otherwise why would clots pass?
On May 29th I started bleeding heavier like my period is here (which its in the right time frame) and the bleeding is still continuing now but not as heavy. I don't know what is going on with me. Should I wait for the bleeding to slow down again and take another pregnancy test or should I be going to the Dr? I have had 4 miscarriages in the past 2 years. I am with the same man. My fiance and I want to have a child but I'm starting to believe my body won't accept being pregnant cuz I've never carried past 8 weeks.
I think I just want to know if anyone else has gone through the same thing I am right now. I am starting to become a mess (mentally) because of it. I am would go to the Dr about this but I'm almost scared for the answer as to what it could be... help?