I had that as well I was told that i was have a uter lining bleeding and not my period. I was givin provera to try to get everything out of me, and start fresh.
Brown blood is old blood that did not come out in your regular menstrual cycle Ive had the same thing happen to me and thats what doctors have told me I just had to start having regular bright red not brown or maroon or dark cycles. I hate it but if you can take met or provera it might help. What helps me the most is low carb and yoga or provera or better yet clomid (35 day cycles) or the best femara (28 day cycles) im on my second month hope it stays this way. I cant take it forever but low carb and met + actos works well if i can stay on the low carb part it hard but can be done. Most of the time if we can get those insulin and hormone levels right your periods will come as theyre suppossed to and nomore brown blood aka spotting between periods. Good luck