I'm still a newbie at this game and haven't read all the previous threads but I've just found out the EASIEST way to get a female pregnant is to just "force" them to do the "Kissing Embrace" OVER n OVER n OVER again until the villager gets pregnant!!

No need to wait for them to crawl into the love shack and wait in anticipation!! I know it takes the fun away but I was desperate for a baby boom!!

Yay!!