Is this normal?

y

So I always get a brown discharge both before and after AF. Well I got it before but only for 2 days which can be normal. But AF was only here for 1 day and was very light. This has never happened to me before. I also haven’t really had many symptoms like I usually do. I’ve broken out and have some back pain but that’s it.

I had taken 2 tests before and got negatives. Is there a reason this could be happening ??