Youd have to speak to your Cardiologist to find out for sure. Going through pregnancy is hard on anyone's body but when you have a heart condition it can sometimes stress the heart out so much you have congestive heart failure or rhythem problems.
Your best bet would be to contact a high risk perinatologist (baby doctor) to see how they handle situations like yours. Your cardiologist would probably tell you not to get pregnant but a high risk OB would be better suited to telling you exactly how pregnancy could affect you.