Hi! and welcome
I have three kids and had them all before I was diagnosed. My first pregnancy was the worst in regards to mood. I was terribly depressed and agitated. With my second, I was somewhat depressed, hypo after the birth, then went into a deep depression. Then with my third I was hypo in the beginning, depressed, and then hypo after the birth.
I think all pregnancies are different and you should tread carefully especially if you think your illness is worsening.