When I fell pregnant in Feb I was expressing full time so I knew how much milk I was getting in a day, my supply halved in the two weeks, sadly I miscarried but my supply picked back up, I fell pregnant the following month (with this pregnancy) and once again my supply halved in my TWW, it was one of the signs for me that I was pregnant, I slowly stopped expressing over the next month or so as it really affected my supply to much to bother with the stress of continuing.

Good Luck!