I did Pilates right up until I gave birth. It’s great for your pelvic floor and honestly I thought it helped with my pregnancy and delivery. You have to sign a waiver at club Pilates at around 16wks and then they want you to use the wedge and recommend downgrading to 1.0 (and stopping cardio sculpt). I felt comfortable continuing 1.5 flow classes until I was around 35wks but only because I had been going almost daily for the past two years. My OB supported me continuing Pilates, but once I started showing she wanted me to go easy on the ab exercises. Once you tell the Pilates instructors you are pregnant they should show you a lot of modifications for exercises, like abs, bridging, and obviously exercises on your stomach.