@Raze99
You could use Sims 4 Studio for that.
Open Studio and on the very first page (after entering a creator name if you haven't already) go to the toolbar at the top and select Tools > Create Empty Package. Give the file a name when prompted and then you should be presented with an empty Warehouse view of Studio.
Now go back to the toolbar and select Tools> Extract Tuning...
In the window that pops up, enter the words you want to search for into the search bar at the top. Only use one search term at a time as Studio tries to match the text exactly. The screen should auto-populate with a list of all the game tunings with the matching word in their name.
The tricky part is knowing which of these results you will want to be looking at. It looks as though searching for "pregnancy" and "trimester" might be your best bets.
Once you have a result you want to look at closer, select it and click on the Add To Current Package button at the bottom right corner. You can add as many as you want to the same package if there are more than one you would like to look at. It will save you having to reopen the tuning extractor each time.
Close the Extract Tuning window and the tuning files will now be in the package for you to look at. Select them on the left and read the contents on the right.
You may notice you also get Sim Data resources added to the package. This is normal. They work in combination with the extracted tuning. Certain data, for example age and gender flags, have to be set the same between the two files.
You can save the package if you want to be able to come back to it later otherwise you can just close Studio when you are done and you will be left with the original blank package you created at the start.
Beyond these steps on how to obtain the tuning I won't be able to help with understanding them I'm afraid if you have any issues there. Whenever I have worked with tuning files I've just done a lot of visual comparison and made test packages to try things out in game.
