I have watched Shotgun Marriage and Wonderful Life with similar theme. More suggestions would be appreciated. Thanks.
I think Little Mom Scandal.
Fated to Love You was good.
the one with shida mirai, forget the title tho
The one with Shida Mirai, 14 Sai no Haha :)
Fated To Love You I Do, I Do
I just saw Saranghe / I Love You with this very theme
Besides the 2 you already watched, and for unwanted or unplaned pregnancy I would reacomend 14 sai no haha, Jenny & Juno and also maybe daisuki (in this one the girl wants the child but the family doesn't because the mother is mentally disabled). Unplaned pregnancy with forced marriage involved I would say Fated to Love You. There are also some good dramas with unplaned pregnancy like Ai wa Mieru, Autumn's Concerto and Only You but maybe they are a little far off for what you want. Good luck! =)
 manlihua:
The one with Shida Mirai, 14 Sai no Haha :)

I enjoyed this!