I know it's vaguely possible and I know it's also very unlikely, especially when performed "correctly". Recent studies are showing only a 4% failure rate and disproving that pre- ejaculate contains sperm, a popular myth of my high school years.
I only ask as we dtd on day 14 and the night of 13; he didn't ejaculate the first time and the second time withdrew with plenty of time to spare ...And the following day he broke up with me! A very final break up. Part of me can't help but hope for a child as I know it will be the only thing to bring him back. I've also longed for a child every cycle and known it hasn't been the right time financially so we never "tried" and kept plodding on withdrawal for the last few years. I had hoped to have a child with him in 10ish years and now that's looking very much off limits. The healthy thing would be to forget and start anew, but very recently dumped after a 4 year relationship and forget reason, unhealthy is all I want atm. Mixed feelings of love, hate, never wanting to see him again and then on one hand wanting to raise a child with him. It'll be a long, hard 2 week wait this one so it would be lovely if anyone could share their own stories and personal experiences with withdrawal. I think if I come out the other side without a baby it'll be the sensible ending but I can't help but dream for the ending that "never was"!