If you have had sexual intercourse with your partner at least once before, you are most likely hoping that all is going to be fine as you continue to enjoy the time that you are together, and nothing is going to come up. That is, until something changes in your body. Most often, pregnancy occurs when there is something terribly wrong with the biology of the body. For example, if you have had sex three days in a row, but your menstrual cycle is irregular or nonexistent, it could be possible that you are pregnant. Although this is considered a case of “missed” ovulation, there is always a chance that something is just not right.
If you were previously healthy, and then something happens that causes a decrease in your hormones such as a tumor, infection, or hormonal imbalance, you could become pregnant. The events that cause pregnancy usually begin with fertilization, where a viable sperm penetrates a fertile egg. Once this occurs, the fertilized egg (known as a zygote), travels through the women’s fallopian tubes to the uterus, where it implantates itself in the uterine lining. From there, it grows into a fetus. A growing fetus will soon reach its full size, and the pregnancy is complete.
Most pregnancies last from about one to four months. However, some do stretch out to nine months or even longer. Most of the time, after delivery, a baby is born, and then the mother resumes her regular monthly activities. However, in some cases, if the pregnancy is unplanned, such as if the couple was having trouble conceiving naturally, the pregnancy can last for several years.