Late no, you haven't messed it up!! The clinic has given you some weird advice but you haven't actually had the treatment yet, so even if you've paid (mine wouldn't take the money until the cycle started so maybe you haven't?) it's not too late to change the treatment plan and refund the extra if you have paid. Which clinic is it again, sorry, I get us all mixed up?
Everything else will be exactly the same - drugs etc. Maybe you can phone tomorrow if you don't get a swift response and then you won't be worrying over the weekend?
I don't know about have a transfer under sedation or otherwise because mine are all still frozen, but someone else might know about that. And you could ask the clinic too?
Stork that would explain why I didn't have to pay extra, thanks, I did wonder if that was the deal but the person who phoned me confused me!