I would get another done. I had mines done at 8weeks and I was able to see my baby heartbeat but to be on the safe side get it done again. But good luck
It depends on how your feeling, if your absolutley sure of your dates and dont want to wait, or if theres a possibility that your date could be off, then wait another week, I myself would always err on the side of caution and get another u/s done just to be perfectly sure, good luck