Good morning sis! Yan ang stretch marks, super common yan lalo na habang lumalaki ang belly mo, almost lahat ng pregnant moms namin may ganyan, kaya don't worry ka muna. Pero since may sakit ka, better mag-check ka with your OB to make sure it's just stretch marks and nothing else, okay? Puwede ring skin stretching lang talaga, pero safe pa rin na i-confirm ng doctor especially kung may discomfort ka.