Hi mama! Normal yan sa ganitong stage kasi lumalaki na ang uterus mo at nag-stretch ang ligaments, a few of us felt the same tugging sensation around that time, kaya hindi ka nag-iisa. Since nag-check ka na ng check-ups and taking your meds, that's good, but honestly best to mention that pulling feeling sa OB mo sa next visit para peace of mind mo lang, especially if it gets stronger or may spotting na kasama.