I feel like Isagi is the one to be depressed during pregnancy because, after all, his goal was always to be a striker and now he has to sit at home like a good wife and go through different kinds of pain, sacrificing not only his career but also health... His situation would be even worse if it's unwanted pregnancy. He would eat a lot of sweets and things he couldn't let himself to have before because of his strict diet, and he'd joke that it's one of the pros of being pregnant (even though he still has a diet to stick to). He'd be quite passive, but would try to act as if everything's okay. Overall, he'd feel extremely conflicted, but since it's Isagi we're talking about, he'd adapt very easily and soon would feel even glad and thankful to be able to give a life to someone. Isagi stays at home with his parents most of the time, consulting with his mother and taking notes about the childcare.

He'd be a good parent, ofc, but I think even after getting birth he'd sometimes feel regret he'd be ashamed of because he actually loves his baby. He'd ignore the soccer news for a while.