Vix I know how you feel. This is the first time that I didn't spend the entire month before worrying about it! While I was sucking the gas I said to my mw, I'm a bit worried about whether this will be enough when it comes to pushing, and she said not to worry about that yet, stay positive etc, and somehow I was able to put it completely out of my mind and keep on working with the contractions.
MWs are really good at coaching too, my mw was saying things like "okay you're almost at the pushing stage, you'll know when you feel like pushing, it will feel like a big poo" lol etc, and all the coaching like that makes you feel confident too.
If you get anxious, make sure you talk about it with DH and/or mw, they will be able to help you find your confidence again. All the best!