Most women ovulate approximately 14 days prior to the onset of their menstrual cycle. Therefore, if you have regular 28-day periods, you should be ovulating on approximately Day 14. The best chance of pregnancy is 3 to 4 days before ovulation and approximately 2 days after ovulation. Therefore, intercourse during this time frame would have the highest likelihood of being successful. There are ways to test for ovulation such as measuring your basal body temperature or testing your urine for a luteinizing hormone (LH) surge. This may help a woman determine the time of ovulation if her cycle is irregular.