Ay, mahirap sabihin kung ano yan exactly kasi maraming pwedeng reasons, baka ligament pain, baka constipation (super common yan sa amin!), or baka need lang rest talaga kung busy ka. Since nandyan na siya ng matagal, better check with your OB or doctor na lang para sure, lalo na kung may ibang symptoms like spotting or unusual discharge, mas peace of mind ka na talaga, tsaka alam mo na exactly kung ano gagawin mo next.