Yan normal lang, sis! Parang muscle stretching lang siya habang lumalaki ang baby at umuusbong ang uterus mo, a few of us felt the same thing around 20-something weeks, kaya hindi ka mag-iisa dito. Pero kung ang sakit ay matinding-matindi, hindi tumigil, or may bleeding, best to check with your OB agad lang para maging sure, okay?