Ay sis, normal lang yan sa pregnancy lalo na sa second trimester, ang bigat ng baby at shifting ng center of gravity mo talaga nakakasakit ng likod, especially kapag sitting all day sa work! A few of us pregnant moms swear na ang frequent position changes, pelvic tilts, at supportive pillow habang seated ay sobrang tumutulong, pero since you're at 24 weeks at ang intensity ng pain mo, mas magaan ang loob kung consult mo na with your OB just to make sure walang iba, like ligament strain or something more. Try rin yung standing desk setup kung pwede, or at least stand and stretch every hour kasi talaga ang prolonged sitting ang culprit dito. Hang in there, mama, maraming amin na dumaan dito at bumuti once nag-adjust kami ng positioning!