Call and go all in on river OR raise and get it in before river

[The_Good_Dr]

3-6 live.

I have 18 chips left when this hand happens. I have pocket 6's in MP. EP1 calls, I call, CO calls, B calls, SB calls, and BB checks.

6 players, 5 SB after drop.

Flop K 6 2 rainbow.

SB checks, BB bets, MP1 calls, I call. CO, B, and SB fold.
With no draws, besides runner-runner out there, I don't raise because I want to keep those behind me in.

3 players, 4BB

Turn is 7. No flush possibilty.

I have two Big Bets left. BB checks, MP1 bets. Should I raise and put in my last two bets or should I call and put in my last bet on the river?