Yes with number 2. It is called placenta previa. If you have your doctor's notes check the grade. Anywhere under 3 and you'll be fine (3 and 4 are more severe but you still have plenty of time for it to move), no matter what though you should get an extra ultrasound to check its position at around 28-32 weeks.

They said the same to me! They should follow up once you are further along but they do move up on their own believe it or not!