Tips for trouble breastfeeding?

Hi! Looking for some tips! I baby is 6 days old and while in the hospital had to stay in the NICU for a few days where they gave her formula to supplement because my milk was not in yet. My milk is now and I can pump a lot. However she is having a hard time latching and staying on to eat. She does fine with the bottle. When my breast are super full my nipples do get small, but sometimes she does just fine. I try for at least 30 mins, but she always ends up getting too hungry and I have to just give her the bottle. I’m going to the lactation clinic on Thursday, but any tips in the mean time is greatly appreciated!