I'm defiantly feeling like a newbie!

My husband and I just decided about a week ago that we want To start trying! Very excited but I am in my old habits of trying to not make a baby when we have sex. In the past I was told to go to the bathroom right away after sex to lessen the chance of a bladder infection and such but now since we are trying to conceive I feel like I shouldn't flush all the good stuff away so fast! Anyone have any thoughts or insight for me? I can seriously use all I can get :)