For us, we planned to start trying but both times was like if it happens it happens, I worked out what my most fertile day was through a website (experimenting if it actually works) and both times fell PG first go. Positive thinking definitely won't hurt but I think negative thinking would have an impact. GL TTC....Oh both times I fell PG I had exactly the same symptoms as I did when AF comes so I was positive (esp this time round) that I wasn't PG...until AF didn't arrive of course.