Ovulation Date & Potential Father: A Pregnancy Timeline Analysis

Question
I am 24. I had my last menstrual areound Jan 25 or 26. My period spotted a couple of days before than became regular. I am pregnant and unsure of my day of ovulation. I had sex with a guy on Feb. 10 and then with another person on Feb 17. I found out I was pregnant on March 1st. Which guy could be the father?

Answer
If you have a normal 28 day cycle (from the first day of your period until the first day of your next period) ovulation occurs on cycle day #14. If your last period started on January 25, you probably ovulated on February 7 and could have conceived if you had sex on February 6,7,8, or 9. I would assume that the father is the guy you had sex with on FEbruary 10.  However, a sonogram will help pinpoint the exact day of conception.