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  1. #1
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    Default Help to calculate my due date

    I am a little confused. Don't think the due date I have will b right. I think I ovulated on day 19 of my cycle but I only have a 12 day lmp. The app on my phone says 28th of March but then I have used this info and it says the 2nd of April.
    I get my blood test results tomorrow. If the doctor is unsure do I need a dating scan??
    Thanks.

  2. #2
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    If you're confident on your ovulation date, go by that. So in an online due date calculator put your last period date as 14days prior to your ovulation date (because those calculators assume ovulation is on day 14). Using LMP for due date is not an exact science and really just based on tradition more than anything else, so go by ovulation when you can. For IVF pregnancies it's all calculated on egg collection dates (ie 'ovulation').

  3. The Following 2 Users Say Thank You to Cue For This Useful Post:

    Apple iPhart6  (28-07-2014),Kazza78  (29-07-2014)

  4. #3
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    As @Cue said, if you're positive you O'd on CD19 then count back to make that CD14 (so say your LMP date started on CD6). I actually told the doctors that date as well because they will always disregard you and say that your bub is measuring too small for your dates even if you try to tell them when you O'd. I just found it easier to tell them my LMP started on the date that made O CD14 and surprise surprise, bub measured perfectly to my dates!

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    Also, congratulations!!!!!!

  6. #5
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    Your due date is calculated based on the first day of your last menstrual period (LMP). Pregnancy is 266 days from conception, or about 280 from your LMP. This is 40 weeks or 9 months (give or take a few weeks).

    You can get an online calculator to calculate the due date.

  7. #6
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    I went with my dating scan because I couldn't remember my last period. The doctor would usually go with your last period date and wouldn't change the date unless dating scan dates are really different.
    My midwife also asked me if I was comfortable with the decided due date. So you could have a chat with your midwife and see what she says

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    I agree with what cue said. using a calculator that has ovulation date.

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    I ovulated on about day 19 with DS and lied the whole time that my LMP started on what was actually CD 5 (14 days prior to O).

    With DD I was straight off the pill and would have ovulated something like 5weeks after LMP so relied entirely on dating scans. Yet the hospital still put my LMP on file - like it had any relevance?!?

    I wasn't going to go through that confusion again. I'm glad I set my own LMP date as, having GDM, the preference was for me to deliver before 40w and it would have been really down to the wire if my dates were 5 days earlier.

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    Totally agree with above
    Always go by o'd date
    and only use lmp if you know you o'd on cd14


 

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