I am sexually active and used to use the pull out method but my boyfriend finished early and I wasn't on birth control so we got plan b. A week later I got my regular period except early. My period ended last week but now I am having this really weird brown discharge. At first I thought it was just my period finishing but now I'm wondering if its something more..

First pull out is not a real method, and even if you consider it one, it has the highest failure rate. There are sperm in all the early fluids so even if they pull out, you can still get pregnant, it juts lowers the chance. So please remember pull out is not a method that stops you from getting pregnant, it only slightly reduces sperm.

But the Plan B ( guess you did not read the instructions that comes with it) but will cause issues with your period for the next month or two,

I have actually taken a plan B in the past. Basically I took the pills, I believe there were two, and then a couple days later my period started. I had a similar situation to yours as well... I had just finished a period and then it was like I started all over again. Basically I think this is because it's like it sheds the lining all over again to make sure you are clear of getting pregnant. I would say go to a doctor if it persists but honestly it's how the pill works :)