OK, my last period was on the 8th and I had sex on the 29th. We did not use protection, but also we didn't completely have sex, being that we stopped after like 3 min. I understand the importance of contraceptives, as well as the lack of reliability in "pulling out". My question now is, how likely is it that I'm pregnant, as most fertility calendars say my most fertile days are the 19th thru the 25th?