Opinions please

I’m a mom of 2... obese and have been off of birth control for 10 months. My cycle is regular (not regular when I was on BC) but has been for the most part recently. I am supposed to start Saturday with the prediction from the app which is usually right on target. I had some bright red spotting last Saturday and it’s been brownish off and on ever since. Am I back tracking with my cycle and becoming irregular? Anyone experienced this and have any insight?