Hi!
There is really only one day per month in which a woman can conceive. Unfortunately, it is difficult to know which day that is. One way to determine the ovulation day is to use ovulation predictors which are similar to home pregnancy tests and can usually be found in the same Isle at the drug store. Also, we have a menstrual cycle tracker and an ovulation tracker right on this site that can help too! Check out
http://www.medhelp.org/user_trackers/list/603463for a list of trackers to add!
Good luck!
Dr B