Aw, that's actually super common sa third trimester, mama! The pain sa singit usually happens kasi ang baby is getting heavier and mas nag-eexpand ang uterus, plus the ligaments connecting your uterus to your pelvic bones are stretching, maraming moms sa group namin nag-complain ng same thing around that time. But since iniwan mo na lang, please check with your OB para sure it's just ligament pain at walang iba pang concerns, lalo na if it's really intense or may ibang symptoms.