Thanks :)
today I started having a bit of red blood mixed in with the brown stuff, yuck. But I *think* i've got this figured out. Alesse is the lowest estrogen birth control pill that there is out there, or so i'm told. Apparently low estrogen levels can thin the lining of the uterus, making it more likely to bleed during activity. Lately, i've been a lot more active, jogging a few miles a day. The symptoms started about the same time as the activity increased, so I can pretty much narrow it down to that.
Unfortunately, I think I will have to change birth control pills, yet again. This is the fourth birth control method i've tried in the past year that hasn't worked... I can't wait until I get married next summer and start trying to have a baby... No more pill! :)