day 1: color of blood is dark brown...as if drying!
day 2: less brown but a bright shade of red.
day 3: red to black.
day 4 (today) I woke up this morning to brown blood. again!

I don't know what's going on. My boyfriend and I both confirmed that I can't be pregnant because we're always safe when it comes to using condoms during intercourse. never slipped off, never ripped open. (though once the condom slipped off of him easily after he reached orgasm. but I think it was because he uhhh was getting small again) THEREFORE this should not be implantation bleeding. o_o;;;

oh yes! and before this maybe-not-period, we haven't had sex for probably 2 or 3 days. so it couldn't have been bleeding from rough sex.

I'm ready to go buy a pregnancy test once I hear from sexperts and other input though :x

Periods sometimes vary, even drastically from what you're used to. SO many variables can create a change: hormone fluctuations, changes in diet, rest, activiy or stress levels, growth changes, the works.

So long as you are up-to-date with your annual pelvic exam and STI screenings, I wouldn't sweat it.