Ay anak, pelvic pain in pregnancy is common, but because you're a first-time mom at 18 weeks, please text or call your OB right away just to be sure, better safe than sorry, no? Kahit tolerable pa yan, it's good to have your doctor check kung ligament pain lang or something else, kasi they know your history best. A few of us mums had similar worries and our doctors assured us after checking, so don't worry, you're doing the right thing by asking!