for the last week and half, i've had a weird brown discharge. it started as a light brown, but now is more of a dark chocolate brown. it's pretty gross, but doesn't smell or anything.

my birth control ran out in february, and i had my annual dr's visit in mid-march, and i was waiting for my next period to end to take the birth control again, but it skipped, so i didn't take it. i haven't had sex since feb.. but i freaked out and took a home pregnancy test, and it was negative. i still haven't had my period, and thus haven't started taking my birth control (the same brand i've always been on). then the brown discharge began, so i thought i was getting my period, there hasn't been any red in the discharge, and i'm starting to get really worried.

could this be because of the month and a half (feb-mid march) when i was off birth control for the first time in 3 years? or could it be an infection of some sort?

any insight is appreciated.