Aw congrats sa buntis, mama! Lower back and belly pain are super common sa early pregnancy kaya don't worry, pero since it's your first time, best talaga na i-mention mo sa OB mo on your next visit para ma-check niya if it's normal stretching or something else, mas peace of mind ka lang talaga. A few of us moms swear by taking prenatal vitamins on time, resting when you can, and avoiding heavy lifting, pero really the doctor will guide you better on what's safe for you specifically. Ingat, at enjoy your pregnancy journey!