Yes, he was able to control poison and tears, but we don't know if it works with blood. We don't know if his powers can work through something as the blood is inside a body. Therefore, he can't see it... Besides, even if Percy would theoretically be able to control blood he'd never do it. He got traumatized on using her own poison against her (forgot her name) and he was in Tartaros, which changes someone. He just wouldn't be able to do it (again), it isn't in his nature. It would take a life threatening situation for Annabeth and even then I don't know if he would be able to do it, not after what happened with that goddess.