In companies where maternity leave is offered via short-term disability here is how it works:
The first 5 days are unpaid - you use any existing vacation, personal, sick etc. If you don't have 5 benefit days you would take up to 5 business days (one week) unpaid.
Short term disability then typically pays until you are released from a Dr to return to work.
For maternity if you have a vaginal birth that is 6 weeks after the birth of your child and if you have a caesarian delivery it is 8 weeks after the birth of your child (so 5 or 7 weeks of 'pay' after your 1st unpaid week). If you have complications (you, not the baby) and your Dr doesn't release you to go back to work most short-term disability can be used until your Dr releases you or up to 24 weeks. At that point Long-term disability would take over payments.
Typically short-term disability is paid at 60% of your regular salary. Some companies pay a certain % the first 2 weeks and then a lesser % the next 2 weeks etc etc. I've worked for companies that do all sorts of different payments.
HOWEVER - benefits (insurance, paid time off etc) aren't paid and don't accrue when you are collecting disability. So typically you write your company a check for the portion of your insurance THEY pay (ie - if your health insurance premium is $25/week paid by you and $100/week paid by them YOU would be responsible for paying the entire $125/ week).
As another poster said - you don't actually qualify for FMLA due to the number of employees. FMLA is unpaid anyway.... it just guarantees your job for up to 12 weeks (including the first 6 or 8 - so an additional 6 or 4 weeks off unpaid based on the type of delivery).
If you want to be fair, I would ask for 6 or 8 weeks (at whatever % is standard for your industry) depending on the type of birth and then your job guaranteed for a total of 12 weeks without pay. That's what is the standard and actually MORE than you deserve based on the size of the company and federal law.
I'm not sure about the discrimination suit - without details it's hard to give advice. If they paid someone else's maternity/paternity leave and then denied you.... you should get equal to whatever they paid the other person.
Hope that helps.