Okay - a question regarding temping and charting for you more seasoned charters!

As a little backstory, I have been loosely charting periods, CF, symptoms, etc for a little over a year. I started using OPKs last cycle and started temping this cycle. I have fairly regular cycles, and tend to O on cd 12 or 13.

Based on general timing, CF, and OPKs (along with a few other symptoms), I am pretty confident that I O'd yesterday (Feb 16, cd 13). However, due to my temps, FF gave me crosshairs and set my O date at Feb 14/cd 11.

I know that I can override FF but, since it's my first month temping, I am a little hesitant to do that. I have tried discarding a few temps around this time, but that doesn't really help. Any thoughts? Here's my chart:

http://www.fertilityfriend.com/m/home.php/a958214

I guess it's not off by much, but it would be nice to have an accurate O date Thanks for any pearls of wisdom!