Hindi super common, pero may reasons ito, stress, hormonal changes, irregular cycles, or sometimes just how our bodies work talaga, lalo na if you're still young or newly regular pa lang ang period mo. A few of us moms experienced this din, at isa dito ay hormonal imbalance lang, so I'd suggest talking to your OB/Gyne para ma-check kung normal lang ito for your body or may kailangan i-address. Don't worry too much, pero better safe than sorry when it comes sa period stuff!