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The fertile days of the month depend on the length of your cycle, how many days 21, 23, 28 and so on. Go to Baby Center and you will be able to type your information into an ovolation predictor which will tell you around about the time of your fertile days.
taking your temperature each morning before you get out of bed can help determine when you are ovulating as well... if you buy an ovulation thermometer there is a chart in it and instructions to guide you. if you do that and get an ovulation kit that will help you a lot. i got this information from my doctor.
2 weeks before the start of your period.