Dark brown bleeding mixed with red

The "pill" is also used to regulate your period. There are three weeks of pills that will be medicated and then a week of placebos. The week of placebos is when you should be having your period. With you going on and off the pill this can be a factor in your irregular bleeding. Remember as you get older your body changes the way it can handle different situations. So where you were able to maintain a regular schedule before, it may be fluctuating a bit. Also, different events in our lives can cause our cycles to shift. So if you are having an exceptionally stressful time right now that can affect you. The brown blood is old blood and the red is fresh. So I wouldn't go for implantation bleeding right off the bat. If you have insurance and can get to an OB I would recommend you do that, or locate a low cost clinic. If you don't or can't afford it, wait another month and see if your cycle balances out. If not then it's time to get in to a Dr. one way or another. Good luck!