I told the father...now what?

So I'm 5 weeks pregnant and the only contact information I have for my ex now is his email, which I'm not sure if he checks it. He lives 5 hours away from me. I sent him an email telling him we need to talk but he hasn't responded (it was yesterday). How long should I wait for him to respond before sending another message, or do I send another one? I don't know how else to get in touch with him so if he doesn't reply then I won't be able to tell him I'm pregnant.