Since I watch mostly korean, I can recommend only this
Empress Ki comes to my mind... but it might not really be the story you are looking for.
Bad Couple might also work for you...
http://mydramalist.com/korean-drama/649/bad-couple
Dont Hesitate is also kind of like that...
http://mydramalist.com/korean-drama/1119/dont-hesitate
Giant has a side story like that (but they didnt get married)
http://mydramalist.com/dramalist/BPetra
King2 Hearts... but she SPOILER
had a miscariage... so not really sure about this one...
Que sera sera... but its more complicated SPOILER
she got married with someone alse and then had a miscariage...
http://mydramalist.com/korean-drama/433/que-sera-sera
Reply 1997 actually fits... somehow :D
Thorn Birds... kind of - but the baby wasnt hers, she just took care of it (complicated)
http://mydramalist.com/korean-drama/651/thorn-birds
Wonderful life could be also a possibility
http://mydramalist.com/korean-drama/321/wonderful-life
From taiwanese here is also Autumns concerto, but it is also more compliacted
http://mydramalist.com/taiwanese-drama/81/autumns-concerto
Well nothing really fits. I think that it is because they dont like time jumps like this. Plus dramas usually portray time beafore mariage (or after) not really both of these time periods. If there is a baby - its eather in the beginning or in the end.
Maybe you will have more luck with japanese dramas, since they have different story. But they re usually too short for such a long story