Hi Vicki,
So long as you were avidly working out everyday prior to getting pregnant you can safely maintain all the activities you were participating in so long as you are confortable and have a low risk pregnancy. Activities like scuba diving, gymnastics, horse back riding, or any other sport that has a higher risk of falls or elbows to the abdomen (think basketball) should be avoided. With Cardio Kickboxing you're going to want to be very careful with the kicks and punches as your pregnancy progresses due to the effects of relaxin on the body. It makes your tendons and ligmanets "relax" which can lead to sprains and strains.
Talk with you doctor at your first appt. And if you have a while before that first visit, see if you can at least talk to them on the phone about your exercise options.
Also, be sure to see check out www.babybootcamp.com Baby Boot Camp is a stroller fitness program that offers pre and post natal moms and dads safe and effective fitness classes where your child gets to stay with you. Baby Boot Camp follow the guidelines set by ACOG (American College of Obsterics) for prenatal and post partum fitness. All of their instructors MUST be a nationally certified personla trainer or group fitness instructor PLUS have additional training in prenatal and post partum fitness.
Staying fit during your pregnacy make labor and delivery easier so check out Baby Boot Camp so you can get back to being active again.