No. No. No. Please sit back, mdu. Please sit back and give him space for a day or 10.
This OW-at-work thing is sooooo new. Your H was drawn back to your subtle pursuit when OW was presumably not working 20 feet from him. This throws a wrench in everything right this very minute.
I would strongly suggest that you absolutely do not contact him today. It would be wayyyyyy too obvious to him. That feels like pressure. Stay the course!
M: 40 H: 44 Married 14 years S11 & D6; D20 & D19 from previous M 2BDs/PAs, 8 years apart Piecing: April 2014