All entertaining euphemisms that you can think of, please.
Here are some I've come across regarding pregnancy:
In the club
In the pudding club
Up the duff
To have one's wind set
Going to the toilet:
I once knew a woman who always used to say that she was going to make a lady of herself,
I also came across the expression "going for a gispy's kiss" - this was cockney rhyming slang, work it out.
More cockneyisms (for a closely allied function):
Going for a pony (pony and trap)
Going for a tom tit