And because of the said exploration in sexual aspects, the risks of sexually transmitted diseases get higher as well. What can you do to raise your probability of developing a girl the next occasion, if you already have two sons and also you want to possess a girl? Is there one method or another to increase the percentages within your of having a boy or a girl? There is no simple method by which the gender of the child can be guaranteed, but the following practice (called Shettle's system) might help. Using this strategy is cost-free; it will be will not amount to anything, just your determination and desire. A progesterone blood test is done to find out how much of the progesterone hormone is in a sample of blood. This female hormone is produced each time a mature egg is released from an ovary after a process referred to as ovulation. This hormone really helps to prepare the endometrium (uterine lining) to take the egg if sperm fertilizes it. If the egg goes without being fertilized, menstrual bleeding occurs and progesterone levels drop.