If they are evil and stupid, such having put something discriminatory in writing then it is a winable suit.
The other way is to look for patterns over a longer period of time and maybe say "look all 10 last employees who were let go were women who got pregnant, there is something here".
But unfortunately if they are not too stupid they would use convenient double-speak euphemisms between themselves. Like say they'd call it "restructuring". Or due to "culture fit". Or just "business reasons". They could be winking to each other when saying that but you'd really need of the people in charge to turn on others and testify.
The other way is to look for patterns over a longer period of time and maybe say "look all 10 last employees who were let go were women who got pregnant, there is something here".
But unfortunately if they are not too stupid they would use convenient double-speak euphemisms between themselves. Like say they'd call it "restructuring". Or due to "culture fit". Or just "business reasons". They could be winking to each other when saying that but you'd really need of the people in charge to turn on others and testify.