Super light period

Looking for some input... I normally have a very regular, heavy/crampy 5 day period (32-33 day cycle). This month (maybe due to stress??) I got a 2.5 day AF which was a cross between spotting and "light" period. It was extremely light and no cramping aside from what seems like a sore tailbone.
I took a pregnancy test about 4 days ago and it was BFN. The other app I have says I O'd on a different day, but glow says approx 11 days ago. I figured I was out this month due to a short LP. Likely a stress related fluke, but anyone else in this boat and testing regardless of "AF"?