You were Remus' wife and Sirius' sister, you got a animagus smile your brother and you knew your husband go lycanthropy, you were pregnant of 5 months and today it was night, a full moon..

So you get into a some sort of mountain, just by the Whomping Willow and you saw Remus.. in his wolf form, his worse fear was the full moon and he got hit by the light off the full moon so you knew he couldn't recognize you in that form.

So of course you were worried because what if he do something he will regret to you, you're his wife and pregnant.. if he do something bad he risk to end you and your baby, a thing he doesn't want to do and always told you that he is afraid of doing that.