The above chart shows a typical menstrual cycle: the cycle begins on the first day of your period, and your ovulation date follows about 14 days later.

If conception has not taken place, you will get your period again about 14 days after ovulation. For details on each phase of this cycle, please visit "The Science Behind Maybe Baby".

In the real world, many of us don’t have an exact 28 day cycle - some women’s cycles are shorter than 28 days, others are always longer, and some vary from one month to the next.  So ovulation won’t consistently fall on day 14 of the cycle for every woman, or even for the same woman every month.

Since you can only conceive during the 24-hour period every month when you are ovulating, being able to predict and pinpoint that window of opportunity is key to getting pregnant.

Charting your Maybe Baby oestrogen readings daily will help you become more familiar with your own ovulation times.  If you are trying to fall pregnant, it’s crucial to know your ovulation time.  We strongly recommend using a chart to record your Maybe Baby readings daily and build your own personal ovulation calendar.

Download a free copy of our Fertility Chart to print and easily record your daily readings.

Download  an example of a completed fertility chart for a 28-day regular cycle, 

Here is a table to help you predict your ovulation day, depending on the length of your cycle.

Cycle Length in Days	Probable Ovulation Day of your Cycle
25	11
26	12
27	13
28	14
29	15
30	16
31	17
32	18
33	19
34	20
35	21

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