8 weeks pregnant spotting off and on 2weeks tiny string like blood clots bright red/brown blood not enough to get on pad miscarriage?

See doc 4 labs, sono: Early pregnancy is prone to staining/spotting. The only definite way to answer your question is to draw the blood level of bHCG, Progesterone. Most of the time, you have to have a repeat test in 48 hours to monitor dynamic changes in hormone levels. Additionally, if your dates are accurate, you will definitely benefit from sonogram evaluation. Good luck.