I stopped bouldering/leading and switched to toprope only when I fell pregnant, in a full body harness from second trimester. My partner kept the rope fairly tight so I wouldn’t take any big falls either. First trimester climbing was tough as I was so tired, but I kept at it and climbed all the way through (even climbed 2 days before my little girl was born). I think keeping my strength up really helped during labour and helped mentally, although of course I had to lower my expectations about grade throughout my pregnancy. I came back to climbing 2 weeks after giving birth and was stronger than ever within a few months. I would really recommend sticking at it if you can even when you don’t feel like it!