We have already been introduced too the major hormones which dictate the female reproductive system: Oestrogen, Progesteone, Luteinizing hormone and Follicle stimulating hormone. The following is a brief explanation as to how they function within a typical monthly cycle which ensures a female is fertile, ovulation takes place and pregnancy is possible or a period occurs if conception does not occur.
The first day of your period is considered Day 1 of your cycle. At this time, oestrogen and progesterone, the 2 main types of reproductive hormones, are at low levels.
In one of the ovaries an egg is growing within a follicle. The selected egg becomes dominant due to the stimulation of Follicle stimulating hormone. The follicle which is developing also secretes oestrogen.
Toward the end of this stage, oestrogen levels rise slowly, then more rapidly.
The follicle surrounding the egg breaks open and the ovary releases the egg into the fallopian tube so it can be fertilized by sperm. The follicle remains in the ovary.
After ovulation has occurs, the levels of progesterone start to increase. If the egg that was released is not fertilized, oestrogen and progesterone levels drop after approximately 2 weeks and the lining of the uterus gets ready to be shed. Your next period begins and the cycle starts again.