Hi Kate
yeah, a trans vaginal scan is fine. Doesn't hurt at all, and just feels like having an internal (when the doc puts his fingers in to check your inner workings). I've had a few of those now and they're absolutely fine and nothing to be worried about. AND you get a great picture on the scan this way!
I'm 7 + 2 and had my first tummy scan today which actually picked something up. Last week they tried that first but it was too early, so did the internal one next. You may end up having the external one when you get there...but either way they're both totally harmless.
k x