Mama, please contact your OB or go to the hospital kung severe ang sakit or may bleeding, better safe talaga, especially at ganitong stage ng pregnancy!
That said, a few of us moms experienced tightening and soreness sa different areas near the end, pero kailangan talaga marinig ng doctor kung ano exactly ang feel mo, could be Braxton Hicks, pressure from baby, or something else na kailangan i-check. Don't worry too much, but let your doctor know ASAP ha, okay?