Not sure how you know whether its reflux or just chucking/possetting.
I think with reflux, they'd be pulling off during a feed and screaming - but you can also get silent reflux where I don't think this happens.

Milo is a happy chucker - he sometimes throws up just as you described - usually though its like straight breastmilk or white curdly looking (partially digested).

He normally does it after or toward he end of a feed and will not cry etc, but just get cleaned up & go to sleep.

A couple of times he's done it while still feeding, and milk goes everywhere!