I have 5 LoR's: 1 MD, 1 DO, 1 genetics (science), 1 epidemiology (science), and 1 human bio capstone (science)
I believe I am in same position as you - no real non-science LoR, although maybe 1 of those can be considered non-science since all are not "hard science courses".
Hoping it doesn't matter all too much.