Hi Ruth -
You are right that you'll probably need to wait for more temps before you know for sure. One single temp doesn't mean all that much in isolation. There are some that subscribe to the concept of an implantation dip which may be what you have on your chart - but
Well bummer that AF arrived so soon!
Hey guys thanks for the advice! I'm going to test the FF link and see if it works:
Homeschooling Mom to Kaitlyn (11) and Kristopher (6)and Angel Babies