Officially missed the window

Did the math today. We decided to try for another baby because I had 16 months of cheaper insurance left. I left my job and got 16 months of insurance with my current plan. They even told me if I wanted another baby, I should do it on this plan with this coverage. We've been trying and trying....
And today, I only have 4 months left on this plan. I don't even think it occurred to me that we'd long past the window. Now, don't worry, I'll still have insurance. I will go on my husband's plan after my policy runs out. Just would have been a better set up on my current policy. 
Just another friendly reminder I'm not pregnant.