There's no such thing as "too early" or "too late". It's a question of whether it's right for you and him at whatever time.
And as for the physical feelings bit ... I've had relationships with and without intercourse, and the one that was most satisfying physically was one where we did everything except intercourse. She was waiting till she was married, but was as randy as me so we were very imaginative at finding wonderful things to do without doing everything.
One female friend told me that although she'd had intercourse, the best orgasms she ever had were from rubbing her crotch up against her boyfriend's, with both of them still wearing their jeans! So while i/c is great, don't necessarily expect it to be like a million times better than the stuff you and your bf are doing now, especially if you're already having lots of fun!