Bleeding

I'm 31+5 & I keep bleeding on & off. After a long day of running around & being on my feet today I started bleeding again. I'm not sure when I should go in anymore. I live 1hr away from my hospital, the closest hospital with a L&D & I have no vehicle until my fiance gets in from work at 4am. How do I know when I'm bleeding enough to start worrying? I know to go in if I'm pouring blood but what if it's less than period bleeding but kinda more than spotting, like it is right now?