Ay sis, side pain during pregnancy is super common lalo na ngayon na 18 weeks ka na, lumalaki ang baby at ang uterus, kaya stretching and ligament pain talaga yan, pero since it's been two days na at di ka sigurado, better to message your OB just to be safe ha, especially with the stress you've been carrying. A few of us moms nag-experience din ng ganyan tapos nabigo lang talaga from stretching, pero walang masama sa pag-check lang with your doctor para ma-rule out anything else and matulog ka ng mahimbing. Sending you love, stress at pregnancy pains together ay tough combo talaga.