You could be experiencing a simple delay in the cycle, if you happen to get regular 28-30 day cycles, as happens sometimes, or in very early pregnancy
, but owing to the very faint repeat test, you should get a serum beta-hCG
test to be more conclusive. If it indeed turns to be a pregnancy, you could be having a threatened pregnancy as an implantation
bleed is around the time of the missed period and is a fresh bleeding and not brown, which indicates a possible old bleed. You should get a physical exam to rule out local causes for the spotting. The cause of your previous miscarriages should be understood as this can have future implications. Finally, you can get a trans-vaginal sonogram which is confirmatory and see a specialist for advice. Wish you good health.