The procedure that you have described is absolutely routine and normal. The left lateral is the customary position for this procedure and it is done under light sedation so as to make it painless for the patient. That is the reason you dont remember anything.In all probability, the doctor must have done a pelvic examination at the same time and he must have deferred it for this reason only, that he will do it under anesthesia
. Else it would have been painful for you.