Shopping advice for growing belly?!!

Ka
I am only 7w6d but my jeans already feel uncomfortable in the waist and my jeggings fold down. I went shopping today and found the perfect fitting jeans, only  the button wouldn't fit. 
Has anyone else started shopping for new clothes? How tight are you wearing your pants? I was wondering if I should go up a size ( but then the legs would be baggy), belly band, or jump straight i to preggo pants.