My twins were born at 33.5 weeks and stayed 3 weeks in NICU. When they came home they were not nursing very well. Besides contacting a LC or LLL I can also suggest a few things:
1. Kangaroo care
Hold your baby with h/she and yourself with no clothes on and have skin to skin contact. (oops.. its ok for you to wear pants and baby have on diapers)

Occasionally offer your breast. Let h/she get used to it.
2. Tube feed while baby is at your breast. Of course use expressed milk.
3. Stay with your baby 24/7. Set up a station for yourself with a nursing pillow, water, snacks, books, diapers etc. This way you can offer your brest as needed immediately. I did this for 2 days with excellent results. We no longer needed to give bottles.
4. When moving around the house, try a sling to keep the baby with you. The smell of your milk may increase the desire to nurse.
This is a few things I learned from other moms of micro-premies.
I hope it helps. Feel free to PM me and let me know how you are doing