Congrats sa third baby boy, mama! Yes, it's definitely possible na magbabago pa ng position ng baby at placenta mo, I have a few mum friends na nag-experience din ng transverse position at low-lying placenta, and some of them nag-turn around pa towards the end ng pregnancy, especially since you're only at 30 weeks pa lang, maraming time pa. But honestly, best talaga na i-discuss ito sa OB mo sa next check-up kasi every pregnancy is different, at kailangan niya ma-monitor mo closely kung paano mag-develop ang position ng baby at placenta mo in the coming weeks. Chin up, mama, marami pang mangyari pa before your due date!