worried...brown liquid at 1cm 39wks1day

rushed to the clinic knina 3am, naghihilab na every 5mins lasts 30secs each. Kaso pinauwi pako sa bahay kc 1cm pa lng daw. Problem is im leaking of reddish brown na liquid, naka sanitary napkin ako kasi kasinglakas ng mens. I may need to go back sa clinic later. Ano kaya tong liquid na to? Malabnaw cya pero hindi clear.