Relaxin is an issue in pregnancy, but more often not until the third trimester, as the body kicks into gear for labour. I was doing body jam too, until I tore my ACL (pre-pregnancy) ... In weeks 4-7 I was doing rowing machine, treadmill, eliptical and upright bike...Right now I am doing stuff all because I keep fainting and I feel wretched! Just go at your own pace, listen to your body, and adjust your program as needed! Congratulations on your pregnancy!