This is my first cycle charting.

I got a positive OPK earlier in my cycle (CD18), but saw no sustained rise in temperature. Sure enough, my period has still not arrived more than 2 weeks after my supposed O (with a BFN). FF removed my crosshairs and it is now looking like I did not ovulate.

Today I got another positive OPK (CD35), which actually lines up with the length of my previous cycle (which was 51 days long). I hope this is the real deal this time.

However, my temps seem so all over the place! I am concerned that there isn't much room for my temp to rise at all. Isn't 37.5 degrees Celsius considered a fever?

My chart: http://www.fertilityfriend.com/home/pui

Please help.