On Revenge, Emily is not just the main character, but she's the brains of her own operation, and frequently the brawn as well. Nolan, Aiden, and Jack are her teammates, but they're pretty clearly her subordinates. Her only near-equals are Victoria and Conrad -- another woman and the ultimate representative of the patriarchy. Her father and her teacher may have been important figures to her, but she's demonstrated time and again that she's a more skilled and adaptive revenger than either of them.
A husband-trapping fake pregnancy on its own is an unpleasant trope, but when Emily does it, it's one more chess move that she's making to stay ahead of her opponents -- it's just that because this is a campy nighttime soap, the chess pieces are fake pregnancies, fancy parties, Black AmEx cards, and temporary amnesia, which she uses to the same effect that a less campy, more "straight" protagonist would use gunfights or legal maneuvering. And we cheer every time she draws another Red X through a ruined life -- the campiness and soapiness of the show is a signal that we shouldn't be looking for role models here, just ruthlessly effective antiheros and love-to-hate-them villains.
Revenge is definitely not consistently feminist -- Amanda was a hot mess (though I liked her in spite of it), Charlotte is a cipher, and Victoria goes through long stretches where she's just stamping her feet to no real effect. But as long as the writers don't lose the thread on Emily, I think she at least remains a very strong character.