I have 3 children (only dx'd a couple years ago with bp). Mood and stability were pretty good during 1st baby pregnancy. But I was 20, and ate very healthy almost vegetarian, except fish. Low stress, I wasn't working, but some relationship problems. Definitely had some depression and melt-downs. I had a strong but short ppd. My daughter has bp, now 18, she's doing well right now.

2nd child, I was still nursing the first, did not want to be pregnant. I was still young, 21, got pretty depressed. I used to punch myself in my stomach and hurt myself and I wanted to die. I wanted an abortion, couldn't afford it, was working full time, then next thing I knew it was too late to abort. My husband was a jerk and on drugs. My dad noticed me depressed and my belly and told me he would help me and it would be ok. The depression lifted and I fell in love with the tiny baby fluttering in my belly. I had pretty bad ppd, but it passed. He's now 16, bp severe case. I think my mood and stress during pregnancy have a part to play in his bp he has now.

3rd child, I was 28, I had a new partner who was very supportive. Low stress, lots of meditation, reduced work hours. My mood was better than with 2nd child, but I had quite a few screaming pulling hair meltdowns. I was maybe a bit hypo, much shopping and wanting sex a lot more than usual. I don't recall any ppd with him. He's now 10, no signs of bp

So I think keeping low stress, eating the healthy foods, supportive partner, a lot of relaxation and time outside in nature will be the good things that help keep mood steady during pregnancy, and post partum. Hope all goes well for you.