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The intercourse closer to your ovulation day would result in pregnancy. You are closer to your ovulation time after finishing with periods. If your due date (completion of 40 weeks of gestation) is known, then you can count back to know your probable conception date and current gestational age. If your due date is March 20th, 2013 (completion of 40 weeks of gestation), then your probable ovulation day would be around June 27th 2012, and your conception date would lie between June 23rd, 2012 to July 1st, 2012 (calculation based on regular menstrual cycles of 28-30 days). Ultrasound scan done for dating can also help with knowing your probable conception date. Visit your doctor/gynecologist for further assistance and clarification.
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Personal consultation(s) with a qualified medical professional is the proper means for diagnosing any medical condition.