I would like to add what I learned. It's all hindsight, having been pregnant four times.

I wish I would have given myself a break. I tried too hard to be the same as I was before. And when I wasn't, I beat myself up for it. I didn't reach out, or ask for physical help, or let anyone see me cry. But I should have.

I think we all want to give the impression of happiness. Especially when we're pregnant.

Whatever you feel, it's okay to feel that way. This is not some failing of yours. Pregnancy literally takes over and it affects all women to varying degrees.
Not everyone is fortunate enough to have it affect them positively. And, to be honest, your feelings may roller-coaster all over the place.
And that's okay, too. It's not your fault.