Aww, ang scary ng feeling na yan! Honestly, nakakanerves talaga pag may ganyan, kaya mejor talaga kung check mo na lang sa OB mo bago mag-alala pa more, could be round ligament pain (super common sore na parang nag-stretch ang muscles), or something else na dapat i-assess ng doctor para ma-sure ka talaga. One of my mum friends had something similar during pregnancy at ligament pain lang pala, pero importante na confirmed ng doctor mo ang sa'yo, oo? Take care, momsh!