Three months is not enough time to say that someone has a sterility problem. One year is considered as a reference period to say that a couple has sterility problems. So, you can keep trying by having sex every day (if possible) especially during the fertile days of your cycle. Fertile days are days around the ovulation. Ovulation happens about 14 days before the next period comes. In women who have regular cycles, ovulation days can be easily calculated. Two days before and 2 days after the ovulation are considered as the most fertile days.