Eggs are referred to as oocytes, ovum or gametes. It is huge compared to the sperm that tries to fertilize it in order to produce children. If a woman is not ovulating, she will not be able to become pregnant. So, one of the first things we determine is whether a follicle is growing each month. A follicle forms around the egg each month and enlarges during the cycle until finally it releases the egg into the fallopian tube where it can be fertilized by a sperm.