2. Lawsuit might give you more headache than benefit. Concentrate on your baby. Treat this as a good opportunity to take rest and recharge.
I have been laid-off when I was 7-month pregnat. The company is a big company, there are plenty of lawyers protect them. The law said the company can not layoff a woman "because of" her pregnancy. If there is no direct cause-result relation between pregnancy and layoff, you do not win the case. It is especially true for a large scale layoff.