Feeling down

My baby girl was born at 32 weeks only weighing 2 lbs she's been in the NICU for almost 3 weeks now. They found some blood in her stool about 6 days ago wasn't much but they stopped her feeds ever since. All labs have been great so they finally started back feeding her today. I just feel so down like she was doing so good and still is but that little set back has really just made me feel like she's not progressing and that she's going to be here for a very long time. She's doing very well though has never been on oxygen still in the incubator vitals have been stable she's gained 13 ounces so far. Is it just me cause I really want her home with me? I just need some advice don't feel like anybody understands how I feel or where I'm coming from.  Could this be postpartum depression?