We can't know when you ovulated exactly. You would have to be temping/charting to know that information. Or using an ovulation predictor kit.

That said, if your cycle is usually 28 days, you probably ovulate around day 14.

Your chance of pregnancy is the same as anyone else's who is trying. It is estimated to be approximately 25%, I believe. It takes a healthy couple an average of 12 months to conceive.

Good luck!

Dec 5th would have put you on DAY 11 . Sexual intercourse on day 11 can get you pregnant seeing that you might ovulate on day 13-14 or even 15....You luteal phase is usually the one that is more consistent. Next time try having sex on day 12, 13 and 14 . And like Ingi said, no one can give you an exact time of ovulation ,just a guess.