Could I still be pregnant?

My DH and I have been ttc since last March and 11 days ago we got a positive pregnancy test. Well 5 days I started spotting and at first it was pink when ever I wipe then it turned bright red and I bleed on and off for 3 days a mix of bright red and brown. I had some minor cramps but nothing to painful. With one or two tiny clots very small about the size of a dime. Well I took another test the next morning and it was really faint so I assumed it was a early MC now 6 days later I took another test just to see if my HGC levels have gone done and it was a really dark positive. This was not Fmu it was really water down I had drank a bottle of water this afternoon so that I could pee for the test. Why would the test be so dark it I had a mc