Good luck, I hope you go into labour very soon!
Once I passed 40 weeks (had bub at 42 weeks) they started monitoring fluid levels. However they did it on a little mobile ultrasound machine at each checkup. I had a textbook pregnancy too, they just did it as routine.
As soon as I declined induction and had huge arguments with the hospital they were initially going to have me in for CTG and fluid check each day. In the end they decided every second day was enough, and as it turned out I only went to one check then bub arrived
Does your OB have their own ultrasound machine or can you just go to your hospital on Monday for a check?