Hello! Help or assist to understand with for or term. US has shown term 9 10 nedel...

[Angela]

Hello! Help or assist to understand with for or term. US has shown term of 9 10 weeks, thus KTR 25 mm, from last monthly has passed or has taken place 8 weeks. If they were on a background of pregnancy then from last monthly has passed or has taken place 12 weeks. Has read through in a calendar on mama. ru, that 25 mm are corresponds or meets to 10 obstetric weeks. So how much at me obstetric weeks??? e. The US puts obstetric or from conception. I want raschitat the calendar on mama. ru. But from last monthly he is less, and from last it is more (vessels in the sizes - 25 mm.)

[Pasenjuk A.M.]

In this case obstetric weeks, 9 weeks +-1 + - 3 days are specified. Those 9 weeks about pervog day of last menses that specifies, what not conception was in the "necessary" cycle but earlier