Have you been trying long? You should be able to get pregnant unless there is some kind of problem. I've heard of Asherman's Syndrome where after a D&C there is scar tissue inside the uterus that can cause issues with conceiving. Sometime the front and back walls of the uterus can even stick together. But I believe that it is treatable. Hopefully you don't have that or any other problems. But if you have been trying for a while and haven't been successful, you should see your doctor asap. Good luck!
It is possible the abortion left you infertile. It happens. If you've been trying for a while I would say go to your ob/gyn for testing.