Hi Nelly4
Agree with all the other replies. Just wanted to add that there is also the belief that we are fertile during a certain phase of the moon - if you google 'lunar fertility' you can read some more about it. This has (anecdotally) explained a lot of women falling pregnant outside of their 'usual' fertile time.
Not sure which method you are using but for me I found the book "Natural Fertility" by Francesca Naish and Janette Roberts a fabulous starting point for all things about fertility.

Good luck - hoping your temp stays high!