Last time i got my period was july 3, 2010 and it lasted until july 8. after that i had sex once or twice, it was totally protected. but on july 28 my boyfriend and i started to mess after breakfast. he knows i dont like to do stuff during my ovulating days. but by accident the head of his penis went in for about a minute. he swore he didnt cum or anything but i freaked out knowing i had to get my period soon. decided to go buy the Plan-B one step pill. i took it within an our of the accident. yet im still freaking out. what are the chances of me being pregnant? BTW i have somewhat of an irregular period. THANK YOU SOO MUCH!