

Every 20 minutes is average for a newborn. It'll slow down around three months, and again around six months. Don't stress about trying to catch every pee right now. Even in countries where EC is the norm, nobody catches every pee with a newborn.

But like pixiepunk said, catching a pee is easier than changing a diaper!
When my DD was that age, I would sit with her on my lap on top of a prefold and a potty bowl at my feet and a stack of clean prefolds next to me. I'd try to pee her in the bowl, and if she peed on the prefold, I'd cue her. Then I'd toss the prefold on the floor and switch to the next prefold. And she never signaled me when she needed to pee. Never at any age. The closest she came to "signaling" was waking up in the sling--I always knew she needed to pee when she woke up. Otherwise, it was always timing for us, and I missed a LOT of pees up until she was about a year old.
Remember that EC is about communication, not catches. It doesn't matter where the pee goes. If it goes in the potty, in a diaper, in a prefold in your lap, on the ground, or in a bowl, doesn't matter--what matters is that you communicate with him about it. When he pees, you cue him, and focus on that communication even if you're not getting much communication FROM him yet. At 21 months, my DD still doesn't tell me before she needs to go, so I still rely on timing, but she tells me after she goes, and her timing is predictable enough now that I keep her in underwear full-time. By cueing him when he goes, you're letting him know that peeing is something you want him to communicate about, and you're giving him a language for telling you (now when we have a miss, my DD hisses to tell me that she peed). So you can encourage communication even if he's not signaling you yet.
And seriously, LOTS of babies don't signal, or their signals are so subtle that their parents never notice it, even if they're EC'ing full time. I know tons of mamas who don't feel like their babies signaled/signal at all, but they still EC. Communication can go both ways!
