Unprotected Sex on the 21 which was 2 days after period. Ovulate I think 27-31. Chances of pregnancy?

Guideline. If your cycles are regular the ovulation would occur around day 14 or 15. The egg lasts about one day and sperm can be viable up to 5 days. Therefore sex on day three wouldn't be likely to result in conception as the sperm would not be viable after day 8. This is a guideline to go on if your cycles are quite regular.