Hi Lorin,
When we did our classes with my first pregnancy we went for 6 weeks I think every Tuesday night.
It covered a few different things each week, like....
* stages of labour
* how to recognise you are in labour
* options available to you during labour
* breastfeeding info
* advice for support people
* before & after care of Mum
* bathing a baby
* the placenta...yep they had one there!!
* birth video
* tour of maternity ward

Enjoy your classes!