It is assumed that you would normally ovulate at about cycle day 14 if your entire cycle each month is 28 days long. I, for example, ovulate between cycle day 14-16 and my cycle is 28-30 days in length so everyone is different and not 'textbook'.
I also observe for other signs such as your cervical mucus getting 'watery' or 'egg white' as this is your most fertile cervical fluid that is needed to aid the sperm on their journey. Also, if you do OPK's like I do, it shows the lutenizing hormone surge to let you know that ovulation is coming within the next 12-24 hours. And, to help confirm that ovulation happened (although it isn't helpful to give you some advance notice.....LOL!) I do my basal temperatures each morning at around the same time to see that my temp has risen (and it should stay up for at least 3 consecutive days) and that I did actually ovulate that month. Once you notice a pattern with your temps that can help
at 8:49 PM on Oct. 19, 2010