Hi, So I'm Worried. Last Month, I Took The Plan

Hi, so I'm worried.
Last month, I took the plan b. I've taking a lot of plan b's in the past 9 months and I haven't had my actual period in about 10 months because of the plan b's. (I know I know, it sounds really bad..) anyhow, this is the first month that I haven't taking the plan b because I wanted to get my period back on track. Me and my boyfriend have had sex this month but we've been safe. When it was time for my period to come, it was brown. I thought that maybe it was the start of my period coming. But the whole week it was brown. One day it was brown with a big black clot in it. And it really freaked me out. It lasted as long as my normal periods usually last. But the whole time it was brown. I had normal period symptoms and everything. Do you think it was just my period getting back on track or something else? I'm worried.