Is this normal?

So I'm almost 3 weeks postpartum with baby number 2. My son is 5 years old and I was diagnosed with postpartum depression when he was about 6-8 months old. I think some of it was postpartum and some situational at the time (worked as a nurse during COVID with a newborn at home). Lately I have been feeling pretty good overall, I'm getting into the swing of things with two, I'm enjoying mommy life and I feel very blessed but sometimes like right now i just started crying uncontrollably and I'm not feeling sad or depressed I'm actually feeling quite blessed. I think what sparked my emotions this time is hearing our 5 year old son talking so politely to my husband and asking him to play and feeling very lucky and blessed and grateful but instead of just smiling or staying calm I burst out in tears which overwhelms my husband (he keeps asking what's wrong and if I'm ok). I feel fine, no sadness or feelings of depression or anxious/overwhelmed, just emotional and teary eyed so I'm just wondering if this is normal almost 3 weeks out and anyone else feel that way (not depressed or sad but rollercoaster of emotions and crying)?