23 weeks pregnant and exercise question?

Since i became pregnant and had the energy to exercise i have been doing kickboxing at home and recently been doing 1hr and 30 mins a day to burn 500 cals off but am i doing to much exercise? I have gained 4.8 kilos and this puts me just in the normal healthy range for my height. I'm waiting on my midwife to call me. Ty for your help :)