Maybe baby...?

What's the actual probability of getting pregnant from precum? My husband and I are getting ready to start over trying to conceive, but he's not quite ready yet. We're not using protection, but he's been pulling out. But, my breasts are sore, I'm nauseated, I have to pee constantly and I'm always thirsty. It's way too early to test and I'm not entirely sure I am. That's why I want statistics. Google isn't giving me anything, my computer is busted and my Wi-Fi on my phone is sketchy. (Bad week for my electronics. LOL)