With our son, it only took once! I had just come off BCP, and we were going to wait one full cycle. One morning, we decided we were too lazy to get up and get protection, and BAMM! BFP a few weeks later.
This time, I'm trying to take it easy and not stress/over think it. However, I'm using MFF, and we BD 4 times during my fertile period this cycle. Fingers crossed that it sticks!