Yes, pilates is perfectly safe during pregnancy. However, you will find that some pilates moves are great and others pose a higher risk, the same for those who are doing yoga in pregnancy.
Pilates works to increase strength and muscle tone in the belly, back and pelvic muscles – all important parts of the body for pregnancy and childbirth. Its benefits include improved balance, increased flexibility and the promotion of muscular endurance.
Once you hit your second trimester, it is time to stop doing any exercises that require you to lay flat on your back. This is because laying on your back decreases blood flow to both you and your baby. Be certain you do not hold your breath and if you feel lightheaded or sick it is time to stop.
During late pregnancy, it is possible that your abs will separate. This is called diastasis and if this happens you need to stop doing pilates.