There is a possibility that you have viable claims against the employer for violation of your privacy rights regarding your medical condition and treatement, and for sex discrimination based on the bending of rules for everyone but you. There is only one way to find out. Use the Yellow Pages or some other source, find an employment litigation attorney, call for an appointment, go to the appointment and tell your story. If that first appointment doesn't work out, try a different attorney. If you go to three or four such appointments with attorneys who are experienced in employement litigation and all of them tell you that you don't have a case, then you don't. If you have a good case, one of them will take it. Make sure that the written fee agreement provides that the attorney gets paid only out of the award or settlement and that you don't have to pay any expenses along the way. Don't delay because there are time limits. Your attorney will advise on whether it is necessary to first file your claim with the Equal Employment Opportunity Commissions.
First, I'm sorry you're had to go through so much in such a short period of time. I practice in California, so I suggest seeing an employment practitioner in your state. At the very least, the Americans With Disabilities Act protects individuals with disabilities, either physical or emotional, that have a substantially affect your ability to participate in major life activities. Depression, as well as the physcial problems of the miscarriage, could qualify you for protection (it most definetly would under California law). If you are a qualified employee entitled to protection, they have to try and reasonably accomodate you. An extended leave can be considred as a form of reasonable accomodation. You need to seek counsel who knows the state laws as well as the ADA.