i had sex with my boyfriend and we were very protective. we used a condom and took caution. but 4 minutes in the condom slipped off somehow while moving into a new position. we didnt know it fell off until 10 secs later when he was inside of me. he didnt cum in me or anything. and i heard that spermicide lube in the vagina and on the penis make it hard for precum to reach the egg. please help. could i be pregnant??