Mama, para sa peace of mind mo talaga, please check with your OB na, lalo na kung may pain, kahit slight lang. First baby kaya totally normal mag-alala, pero ito iyong doctor ang dapat sumagot dito, hindi kami! Could be maraming things, ligament stretching, baby position, or something else, pero kailangan proper checkup lang talaga. Don't worry, most of the time it's nothing serious, pero better safe na. Pag mabigat ang pain or may spotting, go to your nearest hospital na agad, ha? Take care!