Looking at the scale reading I made every Monday, Thursday, at work and Saturday at Weight Watchers, I noticed some irregularities:
The Monday and Thursday weights were with shoes and work shirt (about 2.5lb total)about 5:30 AM. The Saturday readings were made between 9 and 10 AM without shoes but after eating breakfast though the time on two of the tapes stated almost 11AM because one of their three older computers was set to the Indiana time zone which until a few years ago meant that the clock never went forwards or backwards an hour. (I changed it to Central time and let someone there know so it should now be fixed.)
I did get on the scale at the same time of day so it would accurately reflect my situation but realized one of my pants was heavier than the others since it was flannel lined for winter weather and that could have created the one week unchanged situation from which after wearing regular jeans on the 31st, showed a 3lb loss in a week.
Though I consider my memory exceptional, I do not know if I was wearing my heavy pair of pants on the 3rd but the 5 lb loss in three days could have been assisted by what pair of pants I wore those days.