During my experience as a trainer over the past several years, I have encountered and worked with a number or pregnant clients that wanted to continue working out throughout their pregnancies. The good news is that, especially if you had already been exercising for 6 months or more before you found out you were pregnant, it is fairly easy to modify the movements so that you can still participate in a group class if you choose to. Right after you find out you are pregnant you may freak out and worry about what you can and cannot do. Thankfully, there are very few modifications that you need to make during your first trimester. Just remember that this is a time for maintaining your fitness not a time to increase your weights or intensity. And, as always, you should consult with your doctor before beginning an exercise program or to get their ok to continue your current exercise routine.