In 2012 I managed over 6 months virtually on SS WITHOUT any effect on my TOTM.
I'm currently onto day 20 this time and mine is over a week late
No chance of being pregnant as I had a tubal tie, but a bit cheesed off though as the scales have been very slow to move this week and I keep thinking its going to arrive the next day but to no avail so far and its very frustrating !