Ay normal lang yan, mamsh! Usually around 4-5 months pa lang para sa first pregnancy kaya very common na di pa ramdam ng malinaw ang movements, some moms naman ay parang butterflies lang ang mararamdaman at madaling sayangin, hehe. Yung occasional tummy aches mo ay likely ligament stretching pa lang, pero since every pregnancy is different, better check with your OB just to be sure everything's okay with you and baby, okay?