Hi dear, it's weird...how long are your cycles? I can see that the last one was 28 days and you O'ed on cd17, so it would be kind of weird if you do O this time so early. Are you sure you didn't have any fertile cm on cd 18, ro somewhere around this time?? I would rather say that you O'ed on cd18...we will see your temp in next days. did you put your temps to ovufriend? wondering what OF would say.