My period lasts for 3 days usually how do you calculate my fertile days?
ok to really this you need to know what your cycle is, whether it is 28 days or 30, 32, 35 anything like that, if it is 28 days the most common cycle, than it is 14 days after the first of your last period, or 14 days before the start of your expected period, if it is a 30, 32 days cycle any thing like that it is half way after the first day of your last period, and that day is where you are ovulating, 3 to 4 days before and after you are ovulating you are fertile, which means that you cuold posibly concieve on those days or your vagina has the best conditions for sperm to live until it can fertalize the egg when you ovulate, hope this is what you meant
