You wont necessarily ovulate exactly 2 weeks after your period .. but as far as i am aware it usually is around that time. I never can tell when I ovulate (apart from the fact that i am using a fertility monitor) but i know some women can get cramps around that time, sore bbs sometimes and ewcm.
Sperm can survive for a few days (maybe 4?) but the egg only survives one day without being fertilised so you should aim to bd in the week before and on ovulation day (if you know when that is). So that is the optimum time for getting pg. (sounds easy when you say it like that dont it .. lol)
Someone please correct me if i am wrong on the above though
And good luck Lauz .. hope you get a speedy BFP.