safe period 
noun
The time during and near a woman’s menstrual period when conception is least likely.The Biblical description of ‘spilling seed,’ or withdrawal, has its place as do items for trying to find the rhythm in the method of measuring safe periods for copulation without conception....
- Even in cases of unprotected sex, or contraceptive failures such as condom slippage, rupture, or miscalculation of safe periods, emergency contraception can be highly successful at preventing possible pregnancies.
- Given that we were 38 weeks pregnant, it was still a very safe period.
- notifiable
- notification
- notifier
- notify
- no-till
- no-tillage
- no-tilled
- no time
- (not) in one's right mind
- not in the least
- not in the same street
- not in the slightest
- notion
- notional
- notionalist
- notionality
- notionally
- notionary
- notionist
- notionless
- notion seller
- notions seller
- notions store
- notion store
- notitia