When trying to conceive, one of the most important — yet often overlooked — factors is the size of your egg follicle at the time of ovulation. A follicle size of around 18 to 24 mm usually indicates that the egg inside is mature and ready for fertilization. If the follicle is smaller than 16 mm, the egg may not be fully developed, reducing your chances of a successful pregnancy. https://seed.fit/blogs/seedfit/minimum-egg-size-for-natural-pregnancy