So I faked an abortion for four months... and now my ex is saying he's going to take me to court. Is that even possibe? And how much time would I get?

I'm trying to understand your question. How do you fake an abortion for four months; what did you do?

Did you take money from him for the medical procedure ? If so that would be fraud.

Why did you fake it ? What did you actually do

Were you pregnant ? Are you still pregnant?

You need to explain in "alot' more detail what happened