Aw mama, maraming cases talaga ng ganito, a few of us from our moms' group had placenta previa na nag-move up by third trimester, so there's hope pa! The abdominal pain you're feeling with movement and when you're busy is something to definitely mention to your OB tomorrow, kasi kahit common ito, better na ma-confirm kung normal lang or may adjustment na kailangan sa activities mo. Excited to hear kung ano na ang result ng ultrasound bukas, fingers crossed na shifted na siya! In the meantime, try not to stress too much, and rest when your body's telling you to, ha. Let us know how it goes!