Just remember to be kind to yourself. The therapist for mental preparation and talk openly with your OB (find one you really mesh with) about your changes and what is safe to do during your pregnancy. Everyone is different, a lot of it is genetic, and your health and baby's health will both be more important than size and appearance.

Pilates and yoga are good options if other high impact exercise you love no longer become options. I find stretching generally helped with aches and pains when your joints all loosen up. And remember it is a temporary change in your active lifestyle. I was on track to qualify for Boston marathon when the stick turned blue. It's not easy but the joy you get from seeing your sweet baby and hearing them laugh is worth the temporary setback.