Can falling really hard cause a miscarriage? help?!?

I'm 16 and an elite competitive figure skater and there is a slight possibility that I could be pregnant. I train 25+ hours a week and take a lot of hard falls. Most are really hard falls on my butt/back, some are on my knees, and I've had the ocasional fall where I fall on my stomach. I don't really plan on quitting skating, but I don't want to harm the (possibly) baby at all.