Yep, a lot of people use their memberships well. I've been going consistently for 2.5 years and plan to do so for the rest of my life (health and finance permitting!). You do need to make the effort to go. Plan when you are able to go and write it in your diary! Many classes can be adapted for pregnant women, so chat to the instructor or class coordinator and ask about what classes you can do. They are lots of fun!