Usually...: Its never completely safe if you don't want her to get pregnant; however day 4 is quite low-risk. Make sure you are counting correctly. Day 1 is the first day of the period, so most women are still menstruating by day 4. Ovulation usually happens 14 days prior to menses. In a 25 day cycle that would be around day 11. However, sperm can hang around for days. Better to use protection.
Answered 3/30/2015
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