It was necessary to wait until most of the patrons of the Three Broomsticks were too drunk to notice the comings and goings of their fellow patrons. Explaining how and why Hermione had a pregnant teenager hidden away in her bedroom was something she didn't want to imagine. No doubt it would all get back to Antonin if Thorfinn was present. For all she was aware, there were other spies in the tavern she didn't know about. Rodolphus always seemed to know when she was there after all.