<I wonder sometimes if the random thought that we might be pregnant doesn't cause our bodies to start to feel pregnant and delay the period for a few days just from the power of suggestion..>

That is very true..I was freaking out when I was late a month ago and it was delayed 4 more days. 2 children in one year was totally making me panic. It eventually came, but when it did, it was Baaaaaddd.
:x