Yes, it is possible. Ovulation usually occurs on day 11-16. If your period is on the longer side, say seven days, and you have sex on day eight--sperm can survive in the female reproductive tract for up to 3 days or so. Eight plus three equals eleven and BOOM there you go!
Don't forget about Plan B--the morning after pill. It is widely available from Planned Parenthood and most emergency rooms and walk in clinics.
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