Sounds like a Harlequin romance. They were making those into films a lot for the cable channels back then. They still do, that's what fills the days on Hallmark and a couple of the other "women's" cable channels.

If you can't find that one, let me suggest something easier to find but with all of the pathos: An Affair To Remember. It's minus the pregnancy, but that isn't for lack of trying. The most popular version is the 1957 Cary Grant/Deborah Kerr flick, but I prefer the Irene Dunn/Charles Boyer earlier version called 1939 Love Affair.

SRS