Oo naman, totally normal yan! Ang hormonal changes during your period talaga ay nag-aaffect ng mood, some of us get irritable, anxious, or emotional, a few of my mum friends said they noticed it worst two days before their period starts. Try to get enough sleep, eat balanced meals, at if kaya maybe light exercise or deep breathing when you feel the mood swings coming kasi tumutulong talaga. If it's really affecting your daily life or family, okay lang mag-consult sa doctor para ma-rule out kung may PMS or hormonal imbalance, pero sa karamihan ng cases yan lang talaga ang pre-period hormones doing their thing!