20NL villain unknown, just sat down, but bought in 200bb ($40)

four folds, SB opens 80c, hero BB ($covers) 5h4h calls.

Flop ($1.60) Qs-Qd-3h
SB checks
hero bets 1.20
SB calls.

Turn ($4) Qs-Qd-3h-6s
SB checks
Hero 5h4h bets $2.90
SB($38.9) check raises to $8.70
Hero calls

Should I be calling this turn? Still have about $30.20 behind.
River ($21.40) Qs-Qd-3h-6s-7h
SB checks
Hero bets $14.50
SB check raises to $29 (leaves like $1.20 behind)
Hero calls.

I couldn't figure out what hand check calls flop, check raises turn, and then check min raises river.... I thought for sure he had quads, but i'm not folding.