Mood changes?

I feel like my new lifestyle changes are affecting my moods or is it hormones? Before the dieting & exercising I would get jealous over ANYTHING and just bottled it up. Now I sense a shift in my thinking. My sister called me at 1am to tell me she thought she was pregnant & confirmed it this morning. Instead of my usual envy & bitterness I was beyond excited! Even though I may never conceived (so many health issues) I'm going to be an Aunt!!!! 😍😍😍 I can't wait for Harper to arrive!! I already planned the baby shower in one day 😂