would like to know, which is the possibility that i can be pregnant . my last period was on dec 17, 2010. I was supposed my next period on the january 14, 2011. but i didn t, however i was 6 days late. I just got it on january 20, 2011. i had sex on january 10, 13, 17. which are the chances that i can be pregnant. what do you think