Do you stop ?

I’m 12 weeks currently . I had only one early ob appointment at 6 weeks and I stopped smoking a month before because I knew they would do an initial urine screening . After my appointment I started back up. With that said I have an appointment next Wednesday (week from today) I smoked last night . Is it usual for them to test you every visit ? Trying to decide if I should be worried ...I figured I would quit a week before my appointment not sure how long it is in me . But not sure if they even test you each visit or not ?