brown, red and pink mucus a few days before period (on birth

Hi, I'm 21 years old, have been on orthotricycline lo for about 6 months now...was pregnant once, but had an abortion in november...and now my period is supposed to start this week...(possibly today) but i've been having red, pink and brown cervical mucus for about 3 or 4 days...its been worrying me quite a bit...my boyfriend and i have sex often, so i dont know how much that has to do with it...its not really heavy, doesn't leak onto my underwear, only when i wipe...can anyone help me? no stomach pain, or nausea, or cramps....i've been trying to lose weight lately...plus ive been very stressed... help???