Question regarding sperm life and ovulation....please read!?

According to online ovulation calculators I am supposed to ovulate anywhere between April 20th-25th. If I BD'd last night and tonight what do ya'll think my chances of conceiving would be? Just curious...also if any of ya'll know how to figure out ovulation I would appreciate those answers as well. Last 3 periods are April 9th, March 11th, February 9th and they usually last 6-7 days. Thanks so much ;-)