 [ Symptoms ] which is the best option for colonoscopy prep – the tablets or liquid are the tablets the size of horse pills [ Disease ] the easiest way to estimate when you will ovulate is to count back first figure out what day your next period will probably start if your period is very irregular this method will not work for you  from that day count back 12 days and then another four you are most likely to ovulate during this five day range if you are one of the many women who have a 28 day cycle there is a good chance you will ovulate on day 14 day 1 is the first day of your period day 28 is the last day before day 1 of your next period 