Majority of couples will conceive shortly after they consciously start trying. Others will conceive unexpectedly, even when they weren’t really ready. But it can be hard to come to the realization that you aren’t conceiving for a reasonable period of time
Being aware of your fertility status helps with appropriate planning for parenthood. A good example is women approaching the age of 40. They should be keenly aware of declining egg numbers and quality, and hence take steps to conceive sooner than later. Or opt to preserve their eggs for future use.
Most women have a regular menstrual cycle. This means they can predict fairly accurately when the next period is expected. Some will have irregular periods for various reasons. Still, regular periods could change into an irregular pattern, causing a bit of anxiety. Regular periods imply regular ovulation, and high chances of conception. Irregular periods on the other hand imply unpredictable ovulation patterns, and often a delay in conception.