During my period I get brown dark thick discharge stuff mixed with blood. I recently went on birth control but got my period 2 weeks before I took all of the pills. This has happened for 2 months. I had sex 3 days ago and have the dark brown discharge again, and have an itchy feeling. Please help!

The dark brown discharge is old blood. It is nothing to worry about, all women get it at one point or another.

There are a number of things that can cause vaginal itch, such as sweat, UTI, etc. Use some Vagisil and it will soothe the itch nicely for you :)