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How do you think pregnancy is calculated: by last menstrual period or by ultrasound? Previously, thr…

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How do you think pregnancy is calculated: by last menstrual period or by ultrasound? Previously, three ultrasounds showed me exactly on schedule or one day less than my LMP, but at 13 weeks, all parameters were 2 days ahead, not just the crown-rump length. The midwife eventually recalculated the due date based on the 13-week ultrasound and changed my due date and maternity leave start date. In previous times, no one did this, everything was calculated by ultrasound, even though I had a late ovulation before. Now I'm completely confused about how to count?
Here's another question. Screening tomorrow. The midwife said when she booked me that I absolutely d…
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Talantseva Evgeniya
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First by my period, then after the first screening, they added a week. They calculated based on the screening and I went on maternity leave and gave birth according to it.
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October 31, 2026 at 12:15 PM
Tatyana K
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I was told at the maternity hospital that the first screening is the correct one (and that's what they believe).
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October 31, 2026 at 12:15 PM
MIRTsELLA
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They calculate based on the screening. In my second pregnancy, the screening showed I was 5 days less, and now it's 4 days more.
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October 31, 2026 at 12:15 PM
Nadezhda Zuevich
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The doctor and I both calculated all three pregnancies based on my last period, and the due date was based on that timeframe.
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October 31, 2026 at 12:15 PM
yankovskaya yuliya
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In previous pregnancies, they calculated based on the date of my last period. But in this one, I was surprised they used the first screening to determine the due date, which is a week later and also changed the estimated delivery date. For myself, though, I'm still counting from my last period.
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October 31, 2026 at 12:18 PM
Svetlana
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Calculated from the first screening. Maternity leave is calculated accordingly.
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October 31, 2026 at 12:24 PM
Aleksandra
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I counted all my pregnancies from the last menstrual period. The ultrasounds showed the girls were three days ahead in development.
With my second, the "miracle midwife" also calculated it her way and sent me to the maternity hospital at 38 weeks, but according to her, I was already 41 weeks...
I stayed there for 11 days and agreed to an amniotomy.

The only plus was that I went on maternity leave 2 weeks earlier 😂😂😂😂
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October 31, 2026 at 12:27 PM
Anastasiya
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If there's a discrepancy between your last menstrual period and the first screening, the first screening is used for dating. This is how they dated my first child too. Due to late ovulation, there was a 2-week difference.
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October 31, 2026 at 12:27 PM
Anastasiya Kiseleva
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For my first pregnancy, they calculated based on my last period, even though my son was more than a week ahead according to the screening. My gynecologist also sent me on maternity leave based on my period. In the end, I gave birth 15 days before my due date calculated by my period. For this pregnancy, they're calculating based on the screening now, and the due date is 4 days later. I'm roughly calculating around 15-16 weeks. The due date isn't an exact science anyway, I know the range can be anywhere from 38 to 42 weeks.
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October 31, 2026 at 12:27 PM
Elena
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If there's a difference, the due date is calculated based on the first screening. Both times, the due date was set according to it for me.
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October 31, 2026 at 12:33 PM
Nshanyan Knarik
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For my first pregnancy, they calculated based on the first ultrasound because my cycle was irregular and I had a late ovulation.
For my second pregnancy, everything was clear and aligned with both my period and the ultrasound.
For my third pregnancy, my cycle hadn't quite settled yet, and I had a late ovulation from my last period. Plus, I knew the day of conception and ovulation.
So, based on experience, I went for an ultrasound myself, calculated everything, and told everyone throughout the pregnancy a different date for my last period... a week later than the actual one 😀 and everything was clear for everyone regarding the due dates again.
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October 31, 2026 at 12:57 PM
Kondrateva Ekaterina
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Anastasiya Kiseleva The due date is obviously not exact. But when you go on maternity leave is a very important question, as even a few days can make a difference 😁
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October 31, 2026 at 1:15 PM
Lyubov
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Anastasiya Kiseleva Your maternity leave doesn't fall on December 31st, no matter what. Those two days won't make a difference.
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October 31, 2026 at 1:27 PM
Kondrateva Ekaterina
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Anastasiya Kiseleva Huge benefit. Worth working an extra two days or not working at all! 😆
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October 31, 2026 at 1:36 PM

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