Ay sis, normal yan sa ganitong stage! A few of us tried to push through the same thing weeks before labor actually started, so hindi talaga sure sign yan, pero at 38+ weeks, your body's definitely preparing na, kaya the heaviness and discomfort are real. Best talaga na mag-check with your OB agad kung very painful na or may ibang symptoms like bleeding or watery discharge, para ma-rule out anything serious at ma-ease your mind, lalo na kung different ito sa first pregnancy mo. Marami pang reasons bakit ganyan (ligament stretching, baby's position, Braxton Hicks), so huwag masyado mag-overthink, pero tama na i-report sa doctor just to be safe. You're so close na, mama!