It takes about nine days after ovulation for implantation to occur, which brings you to around day 23. How?Ĩ8 things nobody tells you about being pregnantIf you have a standard 28-day period, you will likely ovulate around day 14 and are most fertile around days 12, 13 and 14-when you had sex (or underwent a fertility treatment) to conceive. “All of the research and medical literature have been based on that formula being used.” I had sex two weeks ago, but my doctor says that I’m four weeks pregnant. “Before we understood the physiology of ovulation-and that women don’t ovulate until a couple of weeks after their period, so they really can’t get pregnant until that time-the only thing that primitive physicians and midwives knew was that from the first day of the last period, it was about 280 days before a woman gave birth,” says Scurfield.
#Conceive to due date how to
Wondering how to calculate your number of months pregnant?ĭays since start of LMP ÷ 30 = # of months pregnant Why do I calculate from the first day of my last period, not conception? The formula for calculating how far along you are (or number of weeks pregnant) is simply the number of days since the first day of your last menstrual period (LMP) divided by seven:ĭays since start of LMP ÷ 7 = # of weeks pregnant “Sometimes women bleed after they’re pregnant, but that bleeding is different from a period.” “Make sure that the period you’re tracking was the same number of days as usual and the same amount of discomfort, meaning that it felt like a normal period,” says Scurfield. Calculate using your last menstrual period (LMP)īy far, the most common and accurate way to figure out your estimated due date is to take the start date of your last normal period and add 280 days (40 weeks), which is the typical length of a pregnancy. “ A week can make a big difference as far as the health of the baby is concerned.”ĭo your best to calculate your due date as soon as you discover you’re pregnant. “If a woman goes into labour early, then we really want to know how far along she is, as best as we can tell,” says Carol Scurfield, medical director of the Women’s Health Clinic in Winnipeg. That said, there’s one big reason why an accurate estimate is important: in case of complications. Your due date may become a beacon (my belly will stop growing in three more weeks, right?) or a deadline (I better paint the nursery ASAP), but it’s important to remember that your “due date” will only ever be an estimate of the week you’ll give birth (the vast majority of women deliver between weeks 37 and 41).
It’s a question you’ll hear over and over until you’re holding a baby in your arms: “ When are you due?” Everyone wants to know that magic date, and you’re probably more than a little curious about how far along you are, too.
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