Just feel blah

Amber • My names Amber I'm 28yrs old. I'm a full time nursing student and have been with my fiancé for 13yrs. Due 5/4/16
I was feeling pretty good but this week I just feel heavily depressed. I'm 28 weeks and I can't figure out if it's another surge of hormones or my already existing seasonal depression. I live in Pennsylvania and the weather has been cold and yucky, I do happen to feel like this every year around this time but ugh I feel awful. Haven't been to class all week I'm a full time nursing student and I might have to take a medical withdraw :( feel guilty