Hello. Last menstr. The cycle has turned out at me very short: 18 dn...

[Olga]

Hello. Last menstr. The cycle has turned out at me very short: 18 days (it is usual 25 26). How it is an ovulation has occured or happened so quickly? On what to me to be guided to avoid undesirable pregnancy and where my "lawful" safe days? Prompt, please, who that knows. Thanks.

[Malanova T.B.]

For this cycle it is difficult to tell or say, where an ovulation. For specification of a situation it is necessary to take rectal temperature.