2 days menses & negative

I had “menstrual-like bleeding” on 13th Aug. It lasted like less than 2 days. Went for a check, it’s negative. I’ve never had something like this before. Coz I usually had a fixed 28 days cycle. Tracked my ovulation after the last “menses” & tried again, fingers crossed. Hopefully it’s good news. Been having sore breasts, crampings & mood swings similar to PMS.