I was running about 9 miles and at least 1-2 hours of vigorous strength training a week. Found out I'm 6 weeks pregnant, what is safe for me to do?
Continue same. It's ok to continue vigorous exercise at least through 20 weeks gestation.
Stay active. To start, discuss this with your ob. Generally speaking, it is safe to maintain a healthy and active lifestyle during an otherwise uncomplicated pregnancy. However, you may choose to modify the volume and intensity of the exercises to match your energy level. One simple way is to wear a heart rate monitor and modify your efforts to maintain a heart rate below a certain number.