Yep, so it’s a good idea to verify your coverage with the insurer at the beginning of next year, especially of you think this is a possibility.
I’m assuming you have insurance through your husband’s health plan at work. That makes him in charge of who gets listed on the plan every year at open enrollment time. Most employers have recently gone through the open enrollment process for 2013. If your husband added you to the plan again, you’re safe through 2013 or until you get a divorce. (He can’t drop you from the health plan in the middle of the plan year unless you get a divorce.)
Divorce is a time to be extra vigilant about your personal finances, including your insurance. Many types of insurance revenge are possible.