ff is saying day 13.... the 1st day of my positive LH surge's???? i know my body and I think it was the 14th, the past few month i have been getting 3 surges and i ovluate in the middle day (wel i think so) and my temps go right along.... however i had a SLIGHT temp change on day 13 and it kept going up from there so i guess they considered that my 1st high temp. but im talking it was only, 97.1 - 97-2. I usually ovulate day 15 but AF came a day earlier last month so i figured i would O on day 14, if i change my O to day how bad do u think that will screw things up??