What Causes Red Colored Vaginal Discharge Other Than Periods?

hi, i was 12 days late on my period and took 5 pregnancy tests and had a blood test done and i was not showing pregnant on any of them but now that im finally bleeding its nothing like a period. i have like stringy bright red blood and like fleshy colored clumps. i have no idea what is going on. i had a 2 yr old and have had a miscarriage and this nothing like either of those or an periods i've had in the last 8 yrs....help!? I'm 22 and weigh 128. 5'6"