What’s wrong with my body?

Hi everyone, I’m hoping I can get some help here. I am about 130 days late and for the last month I’ve been having a couple days worth of brown discharge, then a day of bright red discharge, and right now I’ve had light pink discharge for the last two days. It’s never turned into a full on period, and the discharge will only last maybe 2-3 days. I used to be on birth control to regulate my periods since I was about 13-14 years old. I figured since I’m almost 20 now, my periods should be about normal and I was also tired of the weight gain I had from being on birth control, so I stopped. I don’t know if I’m just so significantly stressed about the events that have taken place in my life that my period just isn’t starting, but I have no idea! I was already tested for everything under the book and all labs come back normal. I want to say stress is a huge factor because every time I end up making a flight back home, I end up getting my complete period (I’m flying back home today so I could definitely test this theory). Am I just so relaxed at home my body feels okay to start? Is my body under so much stress where I live that it can’t regulate a cycle? I have no idea and I just need some help!!