Ay alam ko yan, mama, 27 weeks is quite heavy na talaga, lalo na kung first baby mo! Pelvic cramping is common sa pregnancy dahil sa weight at hormones, pero since your OB already gave you medicine, that's good na seryoso mo ito. Just monitor kung mas lumalala or may bleeding, then contact your doctor agad kasi better safe than sorry, a few of us moms from my circle had similar concerns and our OBs adjusted our meds or recommended pelvic support, so don't hesitate to follow up with yours if the cramping doesn't improve or changes.