To me, bravery is being scared of something and doing it anyway. Which, I hasten to point out, makes you brave by default: you're scared of labor and you're gonna do it anyway. Okay, you may not have a choice NOW, but you had the choice whether or not to have another kid and you made what is to me the most terrifying choice imaginable: you said yes to that.

Fear is unpleasant, and personally I have a very low tolerance for unpleasantness, so when I'm afraid of something I normally do it as soon as possible (unless it's breaking up with someone -- I have dragged that shit out way longer than necessary). And it probably feels like you don't have any control over how long you'll feel afraid, like all you can do is wait. But since you're past your due date, at a certain point the medical people are going to start asking you about inducing labor. So if you want to take the wolf by the ears, you could choose to do that, and then you will know almost exactly when you can stop being afraid. (IANAD and I am not advocating this, just saying it's an option.)

IMO, people who struggle with depression, anxiety, and other mental illnesses are colossally brave. They have to be to even get out of bed in the morning. And mothers are colossally brave, too, taking huge risks with their bodies and their emotions and their lives. This is not small stuff. I consider myself a very brave person (my name means "courage"), but I will never be as brave as you.