Hi I'm trying to figure out when i ovulated, some sites are telling me 12/2/11 some are 14/2/11. I want to know how many DPO I am so i know when to test

I am on a 30 day cycle with a 14 day Lutael Phase (i think thats how u spell it) My last AF was 29/1/11.

Me and DH BD'ed on Wed 9/2, Thurs 10/2, 12,2,13,2