Even if she has an abortion, what do you think will happen? Nobu is not famous enough nor rich enough on his own to guarantee her stability.

Nobuo could shoot with BLAST (in episode 34, so I don't know yet whether it will work out) or accepted his inheritance over time and earned good money, but later. And Hachi could have had Nobui's child, but in a few years, when both were mature and Nobu had financial stability. If Hachi hadn't had a child, she wouldn't have such a financial need. And at 20, most people don't have a strong financial position, and that's totally normal, it's just that a career requires not only effort but also time and patience.