Unprotected sex at ANY time (yes ANY !) can result in a pregnancy. True there are days with higher chances and days with lower chances but at ANY given day there are chances to get pregnant. 4 days before your ovulation is time with relatively high chances to get pregnant. "Comming outside" is not a safe way to protect yourself..... in fact it is very unreliable way !. Please note that even a "pre-come" can result in a preganancy. TO make a long story short: If you want to avoid being pregnant make sure you are always well protected !.