If not a regular cycle (28-37 days), quantity or amount of dangerous days (in sulfur...

[The anonym]

If not a regular cycle (28-37 days), quantity or amount of dangerous days (in the middle of a cycle) uvelichevaetsja? What risk zaberemennjat if the sexual certificate or act was on 28 j day?

[Soboleva L.I.]

If you precisely know, when there has come or stepped an ovulation, quantity or amount of "dangerous" days precisely same. The risk of pregnancy for 28 day of a cycle practically is absent.