It definitely does raise heart rate and the first time you will feel it the most. It's legalized speed after all... when I first took Adderall, I was on 20 mg. It was far too much for me and it made my heart beat a little too fast. They eventually brought me down to 15 mg, which is where I felt most comfortable during the 5 years I took it.
10 mg is not that much dose-wise, but you could go lower if need be. And I agree with marc, talk to your doctor about it.
Also realize that if you have an anxiety disorder, adderall will probably make it worse... I took it before I developed anxiety and in fact, my doctor thinks that it might be partly why I developed it. Just warning you now. It's a helluva drug and not one I would recommend staying on for more than a couple years, if that.