I still remember how relieved I felt when I read "Freaknomics" that how successful children are when they grow up does not correlate with if parents read to them or not. I am the type of "careless" mom, maybe more than you are.
So for my two (> 18 ) kids - K1 tells me everything, and I hear from K2 once a week. Just different personality.
Relax and enjoy your life. Your son will contact you if he needs anything,