help me "adjust" my LMP « Back to Group Discussions

[JonesiesGirl]

Can any knowledgeable/experienced mamas help me out with this? I want to adjust my LMP to match my O day but am having trouble figuring out what day to tell the midwife! I don't want to just give her my LMP and mention that I have short cycles because 1: I don't normally have short cycles and 2: I normally have a 12 day LP. Anyway FF gives my EDD as 4 Nov. To get the same EDD from a calculator I have to say that my LMP is 28 Jan. Does that make any sense seeing as I probably Oed on day 12? I'm so confused!

[kikaaaso]

I am going by fertility friend and my ovulation day. I ovulated on Feb. 10th and I am due Nov. 3rd. I am going with Jan. 27th for my lmp to keep the Nov. 3rd due date to give my dr. So I would say Jan. 28th would be right for you :)

[dejagerw]

If I were you, I'd go with Jan 30. That puts your due date at Nov. 6. The Prem Rule is very accurate at predicting due dates. You take the first day of thermal shift, subtract 7 days and add 9 months. I used Feb. 13 as your 1st day of thermal shift. You'd much rather give your doctor a later LMP anyway, so that there is less pressure to induce when you hit 40 weeks. 1st babies usually go 41 weeks too.

Or just stick with your real LMP of Jan 31. That will pad your due date even more.

[JonesiesGirl]

Originally Posted by kikaaaso 

I am going by fertility friend and my ovulation day. I ovulated on Feb. 10th and I am due Nov. 3rd. I am going with Jan. 27th for my lmp to keep the Nov. 3rd due date to give my dr. So I would say Jan. 28th would be right for you :)

28 Jan makes sense to me too, and it works in the EDD calculators, but I just can't figure out how ovulating two days "early" means that I move my LMP back three days! I suppose it doesn't matter as long as I get the right EDD, though. 

Originally Posted by dejagerw 

If I were you, I'd go with Jan 30. That puts your due date at Nov. 6. The Prem Rule is very accurate at predicting due dates. You take the first day of thermal shift, subtract 7 days and add 9 months. I used Feb. 13 as your 1st day of thermal shift. You'd much rather give your doctor a later LMP anyway, so that there is less pressure to induce when you hit 40 weeks. 1st babies usually go 41 weeks too.

Or just stick with your real LMP of Jan 31. That will pad your due date even more.

I hadn't heard of the Prem Rule--that's a really good thing to know about! I do agree with you that 13 Feb looks at least as likely for O as 12 Feb. I'm in the UK so likely my midwife wouldn't offer induction till 42 weeks. Also I'm not sure how accurate ultrasound dating is but I don't want to give inaccurate information and then cause issues if my dates don't line up with the dates from my scan.  

[hapersmion]

I like to give a range of dates - I use the regular one from LNMP, and then the latest day I think ovulation could be, and calculate the due date from there.  That way, I can use whichever one seems most useful.  :)  Of course, doctors would probably kick up a fuss about doing that, but my midwives have always been okay with it.  Not that I've needed the safety-margin, since both boys came at reasonable times, but if they'd been late I could have bought some time.