Oo naman, normal yan sa pregnancy! Ang hormones at increased blood flow kaya mas sensitive at sweaty ang underarms natin, lalo na if may existing skin irritation pa, a few of us din nag-experience niyan around second trimester, super annoying talaga. Try to keep it dry, wear breathable fabrics, at mag-switch maybe sa gentler deodorant muna if nakakaabala. But if it's really itchy, red, or may unusual discharge, better check with your OB na lang para ma-rule out any skin condition, okay?