Dates!

Samantha
Hello guys. 
We have found out we are pregnant with our first child. 😀👶🏼🍼  Been to the docs and they seem to think we are 6 week. However I've put my information into glow and this says we are 9weeks. 
Any one explain this? 
I knows you gotta wait until your scan. But just confusing me. 
😀😀