Thanks ever so much everyone for your reassurance!!!!!!!!!

Being my first pregnancy, I am obviously quite inexperienced to anything that arises. So I am grateful for your replies to this very 'worrying' problem and feel so much better about it. I think I must have landed on the right side of my thigh after my knee hit the ground, as when I went to bed and lay on that side I was quite sore. I have quite a pretty blue knee now too :P