Drawing odds

[50 Cent]

ok, say you have 4 3 in the bb and get a free look at the flop. there's 6 guys in the pot for one small bet each. the flop comes down 6 7 K, giving me nothing but a gutshot. i figure that my hand will be good if i hit my 5 on the turn. odds against hitting the 5 are around 5.25:1, i have sufficient pot odds, so i call 1 bet on the flop.

my question is: if i don't hit the 5 on the turn, do i have to recalculate my odds change on the turn or do i still base it on 5.25:1 to see if i can proceed to the river?

thanks!