hello baby and hello 6 weeks

Wow my body is changing fast .... I feel like I'm getting the pregnancy look really quick is this normal? It's my first pregnancy. I'm excited but trying to keep this hidden for a couple more weeks with family and probably 6 more weeks with the world don't know if that's going to be possible to hide this belly thoughts?!
Pre-pregnancy - bathing suit Jean size 10 168 lbs 
Six weeks and one day - size motherhood pants L. Size 10 Jeans are like far gone on fitting. Weight 164-165 currently 
Any thoughts please share thanks 

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