Aw, first time mom ka pa lang kaya natural na mag-alala! Honestly, kung may sakit ng tiyan at nausea, mas safe na i-check mo with your OB or doctor, could be maraming reasons, from something minor to something that needs attention talaga, especially if first trimester ka pa or newly postpartum. A few of us mums dito, pag may ganitong symptoms, we don't risk it and just go straight to the clinic para ma-rule out kung okay lang or may kailangan gawin.