The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

What, is that a PREGNANCY thing?
The Big Bang Theory Season 9, Episode 18

Hey, this PREGNANCY had
an emotionally-needy third wheel
The Big Bang Theory Season 10, Episode 10

I don't wanna go through this PREGNANCY
listening to you complain about Sheldon
The Big Bang Theory Season 9, Episode 18

but I’d like to continue
with the PREGNANCY.
Money Heist Season 1, Episode 10

The book says at this
stage of the PREGNANCY
The Big Bang Theory Season 10, Episode 5