Ay sis, yan talaga ang common sa second trimester, parang ang baby mo lumalaki ng sobrang bilis kaya stretched na stretched ang ligaments mo doon, lalo na yung round ligaments na malapit sa side! Nangyari rin yan sa akin around that time, parang may nagsasaksak eh haha, pero usually okay lang siya. Pero since masakit talaga, better check with your OB just to be sure na walang ibang issue, basta mo lang i-mention during your next checkup para ma-monitor niya, okay? In the meantime, try na mag-rest, iwas sudden movements, at mag-warm compress if it helps!