Hi mama! Ang ligament pain na yan (round ligament pain) ay super normal talaga sa 4 months, especially pag biglang kumukuha ng movements like getting up quickly, pero since you're also feeling that heaviness down there kapag nag-ihi, better check with your OB just to be sure everything's okay with baby's position, a few of us din nag-worry dyan and it turned out normal lang, pero peace of mind talaga ang kailangan mo ngayon. Take it slow pag tataas ka from lying down, avoid sudden movements, at maraming rest okay?