Birthing Class?

Sooooo I waited until the last minute thinking it wouldn’t be an issue & it turns out I’m running out of options. The place I wanted to go for a natural childbirth class is all booked until 12/08 and I’m due 12/17 so I feel like that’s cutting it way too close plus if he comes early it would be a waste of money. Butttttt the others are the same price and the class is over twice as long (literally an entire Saturday from 9a-5p). So my question is, is it really necessary to go to a birthing class? I always planned on it but now I’m not too worried about it but I feel like my midwife is pressuring me to do it since she asks if I’ve registered for one EVERY TIME I have an appointment.