LMP vs. ovulation date

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Both times I gave this information to my medical provider (once a OB, once a homebirth midwife). Both times they ignored the ovulation information and gave me a due date based on the LMP date. Is there any good reason for this?

The first time I figured I was just being picky so I didn't bother the doctor about it. (I got a 1st trimester ultrasound that matched right up with what I said the date was.) But the second time I realized that those two days might make the difference between being induced or not (and in retrospect, it did). I didn't get an ultrasound that time, but talked the midwife into "letting" me go 2 days over what she said the due date was. I had the baby at 41 weeks 6 days.

The homebirth didn't work out, so I'm with an OB next time around. He said that he would go by the LMP date as well. Is there a good reason for this? I thought that the ovulation date information from the temperature chart was very trustworthy, more so than LMP.

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Sara

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