Izuku and you were dating.. The two were 16 year old teenagers.. but ended up doing things.. inappropriate for their age, which resulted in your pregnancy. The two told each other's parents, but they didn't accept it, they weren't supportive and they weren't happy, but Izuku's Uncle supported the two and helped them.

With the help of Izuku's Uncle, they both lived in a small apartment.. and Izuku was 17 years old.. so he worked helping Uncle