what are the chances...?

[~phyrephly~]

Thsi may seem like a silly question, but I thought I would put it out there for any feedback, comments or peopl'es own experience...

DP and I use withdrawal method. My last AF started 24/05/10. I have a 28 day cycle, reckon I ovulate around CD13/14 (but I am guessing, I dont temp or anything, and I don't know much about my CM). SO I am expecting AF on either 20/06 or 21/06/10.

DP and I BD'ed around O time (5/6 and 6/6) but he pulled out in time. We BD'ed on 12/06 and he came inside, good and proper!

Sooooooo.... what are the chances of conception?? My fingers are crossed, as they are every month! We aren't trying, but I would love to fall PG any old time. Has anyone conceived like this? If I am pregnant, it would mean I had my chart waaaaaay off.

Thanks in advance BB'ers