Mini Pill Throwing Me Off Months Later?

Ugh, so Last December I tried the Mini Pill for the first time and bled crazily for the whole three months I was on it. (So I was on the mini from December to February)

When I came off it, my first few cycles (March, April, May) seemed right on time but they've been late for the last three months or so. (July, August, September)

I have been more stressed/anxious over that time, and I'm starting to work out again. I know that can throw off your cycle but it feels later every month.

Should I be concerned by this point or should I keep logging and give it a little more time.