I have platy fish and would like to know how this particular fish look like when the female is pregnant?

Well I don't know much about that specific breed of fish but I do know that most female fish will look a bit enlarged if carrying eggs. Also, female fish tend to pick rocks up with their mouth and make little piles, kind of like nests, for their babies. Hope this helps a bit!

The belly will be distinctively round.
The round belly will protrude from the sides.

Here are two pics of pregnant platies.
The size of the stomach depends on how many babies the fish is carrying and
How many days the fish is pregnant.
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These particular fish will give birth to live babies.

Wow! Learn something new everyday! Too cute!