Mamsh, please don't wait, go to your OB or emergency right away, especially kung sobrang sakit talaga at may spotting pa. Ligtas lang mag-check, at mas peace of mind ka pa!
Round ligament pain is super common sa pregnancy, pero kailangan bantayan ng doctor kung saan exactly at gaano kalaki ang pain mo, lalo na kang 6+ months na. A few of us mums had something similar and okay lang naman, pero importante na i-rule out ang iba pang bagay para safe ka and baby mo. Huwag mag-alala, the OB will know what to do agad agad!