Hi, There is a good chance of pregnancy when you try on alternate days from about your 8th day of the cycle to about your 20th day.I would ask you to do the same instead of concentrating on one or two days in a month.Also I would ask you to do this for one year before you see any fertility specialist.You may see us sooner if you are more than 35 years,have irregular cycles,have had a surgery on your uterus or ovaries or if your husband has had an abnormal semen analysis n the past.All the best.