Low lying placenta?

Melissa
Has anyone else's placenta not moved enough?  My midwife is telling me it needs to move at least 2cm from cervix ( mine has .9 to go) in order for me to v-Bac.  I'm 33 weeks and feeling hopeless.  Anyone else's moved enough in the final weeks?  Anything I can do?  Baby is head down, so at least that is working in my favor.  Help!