Most women already know that finding a job while you're visibly pregnant can be difficult, if not impossible. Employers can not legally ask if you are pregnant or planning to become pregnant, and they are not allowed to make hiring decisions based on pregnancy, but many still do. In some ways, it's even worse when a company you've been working for decides to discriminate against you because of pregnancy. You may have put in months or years of hard work, but suddenly your employer no longer views you as a valuable and worthwhile employee. Your employer could even try to fire you.
You deserve better, and so do any future women who become pregnant while working for your employer. It can be frightening to assert your rights, especially when you're pregnant and potentially reliant on employer insurance for your medical care. However, you should speak with an attorney as soon as possible if you suspect your employer is mistreating you or refusing to accommodate you because of your pregnancy.