I need help with baby’s BM - Normal?

My baby is 8 weeks almost and is strictly breastmilk. He hasn’t pooped in 2 days. Until last night, he finally went. And it was a LOT (which I expect) but it was watery like. It was yellow/green brown color with no lumps or seed like - just watery. He was so fussy before pooping all day. He usually goes every day. Is he sick or is this normal? Do I need to contact my doctor?