Excuse, the doctor, and if a cycle - 30 days. Also there were no failures in a cycle (see below)...

[Inga]

Excuse, the doctor, and if a cycle - 30 days. Also there were no failures in a cycle (see below). Whether could be, what conception has come or stepped before monthly for 11 days?
And if to clean or remove all frameworks heard that speak, that from date of sorts or labors it is necessary to take away concrete digit (like 239) and day of conception will turn out. Whether it is correct. It is very important.

[Pasenjuk A.M.]

Yes, could be such, that conception has attacked 18 20 day of a cycle because it is usual the second phase lasts no more than 12 days. About a way of calculation of day of conception I shall tell or say nothing, because pregnancy to last from 266 till 294 days from day of last menses......