View How Many Months Pregnant Am I Calculator Background. To calculate how many weeks pregnant you are, this calculator looks at the first day of your last menstrual period (lmp) and compares it to today's date. But most of our calendar months last 30 or 31 days.
At this early stage of prenatal development, the embryo is called a blastocyst.
Implantation is the beginning of pregnancy at which stage the embryo adheres to the wall of the uterus. It can be tricky at first to work out how to count your pregnancy in weeks and months, as when we measure your pregnancy from the start of your last period, your baby is actually two weeks younger than the pregnancy start date, otherwise referred to as. Using our ovulation calculator can help you pinpoint when it is best to try to get pregnant by predicting your most fertile days. When calculating an estimated due date, pregnancy is 40 weeks or 280 days from the first day of a woman's last menstrual period (lmp) to the estimated due date.