Had sex on feb 7,12, and early morning 3:30am on the 15th. what are my chances of becoming pregnant? i think ovulation was the 15th.

25-35%: Fertility rates among the general population approaches 35% per cycle.

Pregnancy: It is important to know that during the first two days of a woman’s cycle (day 1 being your first day of bleeding), the average risk of pregnancy is virtually zero. After the first two days, the risk starts to rise steadily, reaching 9% on or about day 13. Then it begins to decline slowly until it levels off at about 1% on day 25. It stays at about 1% for the rest of your cycle.