Sorry to hear about your predicament.
In Texas, an employer cannot terminate your health insurance mid month. They can immediately notify your insurance carrier so that starting the next month, they are not liable for your husband's premium unless you guys elect to go on COBRA or the State Continuation Program. Being that October is not over yet... you still have insurance through the 31st.
Depending on the size of the employer you may qualify for COBRA or State Continuation. If it's a small business it will be under the State Continuation Program. Under either plan, your husband will get a subsidy for at least 9 months. It is for about 65% of the premium his company was paying for your family plan. At least for State Continuation, the insurance co. will not bill you directly, but rather the insurance company will bill his old employer and you guys will have to remit your portion to them. His former employer will then remit your premium along with theirs. You can continue COBRA/State Continuation longer than the 9 months, but you may not have a subsidy. The laws can change and extend the subsidy period. You'll have to stay informed thru your health insurance carrier. You should call your insurance company tomorrow and ask these questions:
A. Which Program you qualify for?
B. Which billing will apply? (Direct or thru former employer)
C. Will the new baby be covered upon birth? If not, what can you do?
D. What would be your subsidized premium?
E. How long will you get the subsidy?
F. What paperwork do you need to sign and your husband's employer so you may get started (if you so choose)? Can they please send it to you?
Best wishes and God bless!