Why does it say, "He fled, and went outside" (both in this verse and 39:12); but in Pesukim 39:13 and 39:18 it says only, "he fled"?
Seforno (to 39:14): She began to scream because she thought that Yosef was running to report her; but when she saw that outside he did not run, as everybody else saw, 1 that is what she told them. However, when speaking with her husband, who had not been there, she reverted to her original story - that Yosef ran outside as well. 2
Why does the Torah record her words to the household? Surely they did not lie to Potifar, to say that Yosef did so to them!
Ha'amek Davar (to 39:15,17): This helped bring about the result, with Hashgachah. The household did not accept her words, so she needed to tell a new story to her husband.