Oo, normal yan sa pregnancy, lalo na pag lumalaki na ang baby at pushing sa stomach mo! A few of us mums experienced heartburn starting around that time, and honestly it got worse towards the third trimester kasi nakadikit na talaga lahat. Try eating smaller meals more frequently, avoid spicy foods, and sleep with your head elevated, pero if it's really bad or making you vomit a lot, please check with your OB kasi they can give you safe meds na okay during pregnancy.