be pregnant
(have a) bun in the oven
very easy
piece of cake
reveal the truth
spill the beans
something you don't enjoy
(not my) cup of tea
a person who is often in trouble
a bad egg
to make the first step
break the ice
very relaxed
cool as a cucumber
to make troubles
be a pain in the neck
get upset over something that has happened and cannot be changed
cry over spilled milk