I'm not trying to be a downer, but from what I've read while the egg might survive that long chances are most likely 0%. The study I read (don't remember where) showed that of all the women in the study, after about 12 hours out, the # of pregnancies was zero. (I had the day after q a few months back so I researched it to death) I think in the past it was thought this was a potentially fertile time (with margins of error it looks like a fertile time), but I suspect that we will learn that is wrong, and that even at the point of ovulation it might be too late, better to have it there during ovulation. On a positive note, you could have ovulated just a little late, and there is always a chance..., and everyone's body is different. There probably are people who have been pregnant the day after.