A member asked:

Lp was dec30-jan13. dd nov6. conception calculator says feb7-13 was sex leading to conception. not possible. just curious if u/s can be off a few days?

A doctor has provided 1 answer

Dr. Gerard Honore answered

Specializes in Fertility Medicine

Yes it can: When (date) and "how far along were you" (gestational age) when the US for dating was done? Ultrasounds in the second trimester can be off by as much as a week in either direction, third trimester US can be off by even more. First trimester (1st twelve weeks) should be correct +/- 3 days, I hope this helps.

Dr Holzman agreed

Answered 6/24/2015

2.7k views

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A member asked:

Lp was dec30-jan13. dd nov6. conception calculator says feb7-13 was sex leading to conception. not possible. just curious if u/s can be off a few days?

A doctor has provided 1 answer

Dr. Gerard Honore answered

Dr Holzman agreed

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