Math question about pot odds in poker....

[All in Che]

ok its very simple concept but many people are confusing me:

in texas holdem game I have As7s
flop Js 3d 9s (ok I have a nut flush draw)

ok so out the 47 unseen cards in the deck I have excatly 9 cards 9 outs that will make my flush (I know the 3s can make a fullhouse but for simplicty I will include it)

so the pot on the flop is: $60

I have to call $10 on the flop for the next card so (I have 6 to 1 pot odds & my odds to make my hand are 2 to 1 on the flop) so its a profitable call right??

now on the turn a 8h comes so now the pot is: $70
I have to call $30 for the river card (so my pot odds are 2.3 to 1 or 2 to 1 and now my hand odds are 4 to 1 to make the flush on the river) so now it is incorrect to call because its not profitable, hand odds > pot odds which is no good right??

This is the right math correct?

Thank You