Light brown vaginal discharge 1 week before period. on birth control for about a month & 1/2 now. very light cramping. help?

Breakthrough bleedin: Breakthrough bleeding (bleeding at the wrong time) is very common on birth control. It happens in about 1/3 of users. Its no big deal and usually self corrects over time. If you are not satisfied or it continues to happen then consider using a different birth control method. It is a common side effect and does not mean something is wrong or that the pill is not working.

Change pills: Although it can take up to 3 months for your cycle to adjust to birth control pills, breakthrough bleeding is a very common symptoms of pills that have too little estrogen or triphasic pills. If your pills has the term "tri something" in it, ask your doctor about a monophasic pill.