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Women have cycles that are not all the same length but most women ovulate 14 days before a period is due. That is what makes the difference. At 7 weeks ultrasounds are accurate to within 3 days. At 20 weeks they are accurate within 5 days When I had my first pregnancy my cycle was 36 days which would mean my EDD would be 8 days early if my LMP was used, my US agreed with my cycle not my LMP. When I had my second pregnancy my cycle was 28 days and my ultrasound agreed with my LMP. So you are saying that the ultrasound is more accurate? Yes, the ultrasound is more accurate. I did go round the houses a bit to say it.

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Q: Your doctor says that an us is more accurate than lmp because a lot of woman don't remember their lmp and that you could ovulate at different times how true is this?
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Related questions

Can you ovulate the day after your period ends?

http://www.americanpregnancy.org/gettingpregnant/ovulationfaq.htmThis site says that it is possible to ovulate the day after pregnancy and that it is not accurate to say women ovulate 14 days after their period. Every woman is different and they ovulate at different times.


Can you get pregnant the day you start your cycle?

Yes of course you can, just remember everyone is different, you are not abnormal. But if you are concerned or want to ask questions ask your nurse/doctor, You can ovulate at any point during your cycle. Remember every girl goes through it.


Due date is Feb 10 2007 when did you conceave?

You can google "due date calculator" and work it in reverse until your get your conception date. Remember though, that these are approximate because the calculators assume that you ovulate on day 14 of your cycle but women can ovulate during a range of days around day 14.


Why do you vomit for at least 8 hours and experience a fever when you ovulate?

It's difficult to give an accurate answer over the internet because it could be for many different reasons. It would be a good idea to speak to a doctor or nurse about it as there may be something they can do to lessen these problems or stop them altogether. It may be caused by a hormone imbalance


What does it feel like to ovulate?

Well when i ovulate, i get pain one sided it is quite painful but not really unbearable i get warm and sometimes feel sick...but everyones different.


What occurs on about 14th day of the menstrual cycle?

Around the 14th day of the typical menstrual cycle is when a person is likely to ovulate. Everyone has different cycles however so some people may ovulate at different times than this.


If i cant get pregnant is it because i ovulate during my period?

No, your period follows ovulation.


Can a woman ovulate if she is pregnant?

No; a woman will not ovulate if she is pregnant.


What is the difference between a spontaneous ovulator and an induced ovulator?

Spontaneous ovulator is like animals that ovulate out of nowhere. Induced ovulator is when animals ovulate because of/after mating like Llamas and cats.


Can you be pregnant and still ovulate?

No, once you become pregnant your body no longer releases an egg because the one before has been fertilized. It you could still ovulate it would cause you to have a period.


How long after missing 3 birth control pills can you ovulate?

You may ovulate straight away or you may not ovulate forseven days. You need to continue taking your pills as normal and you will also need to use a backup method of protection for seven days because you missed pills.


How many days after period do you ovulate?

When you ovulate depends on your menstrual cycle. You ovulate two weeks BEFORE your period, so how soon after your period you ovulate depends on how long your menstrual cycle is.