It is a terrible reaction. The Countess already thinks the yellow roses was pushed by Lucia so she will also think this was Lucia. Hugo needs to have an actual conversation and tell her he is not into her anymore.

He also still thinks that he knows the process for pregnancy ie feeding her his blood for a year prior to taking virginity so thinks that Lucia already can’t be used as she doesn’t meet the criteria which is why he can’t connect the dots along with Anna deliberately hiding Phillips real approach