Freaking out?

gave birth 12/7/07...had what i think was my period (not sure bc i was bleedin on and off since my csection) on 2/12/08...have not gotten period since...was d for less than a min once around 3/7/08...the of a fiance slipped in while i was sleeping and when i woke up and realized it i made him pull out...nice guy right? ne ways im freaking out to say the least but i never had a normal cycle to begin with so i dunno...are my chances really high from gettin pregnant from his pre...