Bottle feeding

Baby born at 30 weeks and 2 days...currently 37 weeks exactly and still in NICU. The only thing keeping us here is feeding. We have chosen to do bottles of my breast milk as my maternity leave is quickly coming to an end. We have been trying for about a week and she still is only taking about half a bottle every other feeding. Dr says 95% of babies she has seen figure it out at the 37-38 week mark so I'm hoping it clicks for my daughter soon. Anyone have a bottle fed preemie? And how long did it take for them to get it?