Hello there,,,,well the history you gave is insufficient,,,i mean you were raising your replaced hip....now was this in sleeping position or were you in side lying or sitting position?? Did it completely cross the right hip ?? You felt weak in your muscles and it fell? Did you take any medications to relieve pain?? Have you started bearing weight on the left knee? Please do write back to me with answers to the above question?

If you are able to bear weight then you should be okay. To confirm get an Xray done and review.