![]() Using both the date of your last period and the length of your regular cycle, or exact date of conception, our due date calculator will quickly work out your estimated due date, tailoring it accordingly for longer, shorter, and average cycle lengths. Luckily, our due date calculator can help. Unless you can pinpoint exactly what point of your ovulation cycle you were in at the time of fertilization, it’s difficult to know how far along you are and what date you’ll meet your baby. That means that simply estimating nine months from the day you take a pregnancy test isn’t going to calculate your due date, and, even so, factoring in a few weeks here and there for ovulation won’t either. This means that in the first 2 weeks or so, you are not actually pregnant your body is preparing for ovulation (releasing an egg from one of your ovaries) as usual. Many won’t be aware of their pregnancy until their first missed period, and by that time they could be up to five weeks in. Pregnancy Calculator When was the first day of your last menstrual period How many weeks will you be pregnant on a given date On which date will you be. 1 to 12 weeks pregnant You and your pregnancy at 1 to 3 weeks Your weeks of pregnancy are dated from the first day of your last period. ![]() Most expectant mothers don’t realize that both menstrual and ovulation periods count as the first two weeks of pregnancy. The size of your uterus, which will be noted when your initial internal pregnancy exam is performed, can also be a factor in pinpointing the EDD.While it’s true that most pregnancies last 40 weeks, there are other factors at play which will determine your due date.Your fundal height, which is the measurement from your pubic bone to the top of your uterus, is checked by your practitioner at each prenatal visit and helps confirm your due date. Pregnancy milestones such as the first time the baby's heartbeat is detected (around week 9 or 10, though it can vary) and when you first feel fetal movement (on average between 18 and 22 weeks, but it can be earlier or later), can give clues as to whether your due date is accurate. Your period and ovulation are counted as the first 2 weeks of pregnancy. This is based on a 28-day cycle but is adjusted for longer or shorter cycles. It is worked out by adding 280 days (40 weeks) to the first day of your last menstrual period. Other clues can help your health care provider figure out how far along you are and better pinpoint your due date at your prenatal check-ups. The pregnancy calculator gives you an approximate due date. Some practitioners perform them routinely, but others only recommend one if your periods are irregular, you're 35 or older, you have a history of miscarriages or pregnancy complications, or the due date can’t be determined based on your physical exam and LMP. ![]() Just be aware, however, that not all women get an early ultrasound. Just choose "ultrasound" from our Due Date Calculator choices. The timing of an early ultrasound can sometimes more accurately date the pregnancy than your LMP and other methods. ![]() Even if you can’t pinpoint when you conceived, forget the day of your last menstrual period, or aren’t sure when ovulation occurred, the date of an early ultrasound, if you have one, can help your practitioner determine your due date at your first prenatal appointment or another prenatal visit in your first trimester. ![]()
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