If the major issue is getting pregnant, then some contraception is involved... if it's him, she needs to talk to him. If it's her, stop taking it... that little blue line will make him think and give him a deadline of 8 months to get on with whatever.

They have already discussed children, I'm presuming there are no drastic money issues, and that the marriage is sound.... then it can't really be classed as 'entrapment'....

(If she can't get him to talk about his contraception, then taking him by surprise in an unusual location is a good way of 'forgetting' it, and may even get her some extra pampering, if my memory serves me right!)

Good Luck!

LTS