And by the way, the menstrual cycle does not take place during the pregnancy period. And that's because we don't want to actually get rid of the lining of the endometrium because we have a growing embryo and a growing fetus within that endometrium. So we see that the human gestation period can be broken down into three stages. We have the first trimester, the second trimester and the third trimester. And then following these trimesters. We have the process of birth take place, and that can also be broken down into three stages.