![]() Gestation at a future or past date: Use to calculate gestation in the future or past. Conception date: If conception is known (eg, date of insemination, ovulation or egg retrieval), then the due date can be calculated by adding 266 days. INSTRUCTIONS Enter last menstrual period (LMP), current gestational age (GA), OR expected due date to determine the other two, plus estimated date of conception. This calculates the current gestational age and gives an estimated date of LMP. In other words, you might not actually conceive until days after having intercourse. Calculates pregnancy dates, forward from last period or backward from due date. You should also know that a man’s sperm can stay alive inside your uterus and fallopian tubes for several days after intercourse. If your cycles are irregular, this method may not work for you. Also, remember that these estimates are based on the average woman’s regular 28-day menstrual cycle. You can even become pregnant during your menstrual period. It is possible to become pregnant at any time during the month, not just during your ovulation period. Keep in mind that this method isn’t 100% accurate. Ovulation is a normal part of a woman’s monthly cycle, and it usually happens about two weeks after your menstrual period ends. This should give you the start of your ovulation period, when your body is most fertile and likely to become pregnant. ![]() All services are free and confidential.To estimate your conception date based on your menstrual cycle, simply add approximately two weeks from the first day of the last menstrual period you had before you became pregnant. Call (252) 519-4357 to schedule your appointment or walk in during our office hours. We’re conveniently located on East 10th Street in the Forest Hill shopping center. If you’re not sure if you’re pregnant, not sure how far along you are, or have other questions about pregnancy and your options, call or visit Pregnancy Support Center of Roanoke Rapids. If you are interested in getting a free pregnancy verification ultrasound, call Pregnancy Support Center today at (252) 519-4357. The Fertile Window: The Days on Which Intercourse May Have led to Conception. Alternatively, count back from the estimated due date: Estimated conception date October 8 - 266 Days Estimated conception date January 15, 2017. If conception is known, the calculator begins with the conception date and adds 266 days to reach an estimated due date. This method is much more accurate than date-based calculation. Example: Calculate Estimated Conception Date LMP JanuEDD Octo. Pregnancy ultrasounds look directly at the development of your growing baby to determine its age and when you likely conceived. This is why a pregnancy verification ultrasound is the best way to know how far along your pregnancy is and to determine when you conceived. ![]() All of these factors can make it hard to know when exactly you conceived. This is based on a 28-day menstrual cycle. Conception is a process and takes time, and a man’s sperm can actually stay alive inside your body for up to a week after sex. Due date can be calculated by adding 280 days to the first day of your last period. You can also simply try to determine the last time you had sexual intercourse, but this method isn’t totally accurate either. In other words, calculating conception based just on your body cycles can be difficult. How many weeks are you pregnant for Around 90. Some women simply aren’t sure when their last period was. Find out the first day of your last menstrual period Subtract 3 months from that date Add 1 year and 7 days. Others have ovulation periods closer to or further from their menstrual period. Our calculator uses this information to give you an estimated due date. Add this length of time from the first day of your last period to get an idea of your due date. Some women’s menstrual cycles are irregular. The most common way to calculate your pregnancy due date is by counting 40 weeks or 280 days from the first day of your last menstrual period (LMP). However, not all women have the same cycles of menstruation and ovulation. Ovulation usually occurs about two weeks after your menstrual period and lasts for two or three days. In general, women can only conceive when they are ovulating - that is, when their ovaries release a new egg into their fallopian tubes for fertilization.
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