No poops but lots of puke

Amy • 🌈💙 rainbow baby Aug 2017

My son who will be 5 months next week and is EBF has not been pooping much. He has been only pooping every 4-5 days. I’ve read a lot about this and asked my doctor at our 4 month checkup and was told it was fine. But I’m worried as he pukes a lot when he doesn’t poop. He seems to still be putting on weight and overall happy - other then today.

What should I do?!? Could something but wrong with how he is digesting milk?