It's hard to say hon, sorry! You could have O'd around cd23 giving you a short LP.

I strongly suggest you sign up with Fertility Friend and start charting properly. Also get yourself a basal body temperature (BBT) thermometer (or you can use a normal digital thermometer but they aren't as acurate) and start using OPKs. I'm a huge fan of the digital OPKs. They are pricey but take out all the guess work. I used cheaps and then Clear Blue Digital OPKs and fell pregnant with DD the month I used the digital ones.

Good luck!!