well the way to tell if you have ovulated is your last 3 temps have to be higher then the previous 4 if that makes sence
http://www.fertilityfriend.com/home/1f41f1 theres mu chart if u see where the red cross has been drawn the next 3temps are higher then the ones before the cross day. also a way to make sure ur themometer is working properly is to get some boiling hot water in a cup then dip ur thememometer in it only the metal bit and see if it rises to its maximum temp.....if u got any more questions ya can pm me if ya wants.....xxx good luck xxx