Hi there, I hope all is well with your BT tomorrow. Perhaps your pg is fine, but you have your dates wrong?? Re the dating u/s, yes it can be done internally if the sonographer can't get a good enough picture through the abdomen, but you can always specify that you only want the abdomen scan. Just so you know, the internal u/s probe is smaller in width than a penis (well, most penises ) so it would be no more uncomfortable than having sex. With a pap smear they put the speculum in and that is way bigger than a probe. Still, you should consider a dating u/s so that you have a good idea of your due date.