Uy, kung yan ang nararamdaman mo lagi at nakakabother, better to check with your OB or doctor na para sure, okay? Hindi kami pwedeng mag-assume kung ano yan based lang sa description. Pero realistically, maraming possible reasons, mula sa posture habang natutulog, to stretching, to other stuff na kelangan talaga i-assess ng medical professional. Pros ng pag-check: peace of mind at actual solution. Cons kung hindi mo i-follow up: hindi mo alam kung may underlying issue na dapat i-address. I'd really lean towards getting it checked so you can sleep well and relax.