Bleeding again- I never know what to think anymore !

Of-course at 10pm last night I go to the bathroom and yet again- seeing red !!!....I'm 36 weeks , supposedly my previa is non existent anymore, not even low lying so WTH ???...Called my OB, for the umpteenth time in the past 9 months and he just told me to keep an eye on it, if it gets worse to call him back, otherwise he'll see me Wednesday at my regular appointment and will also do yet ANOTHER sono ( I really hope these sonos arent bad for my )...I swear when and if I do go into labor , I probably won't even know it- between the odd contractions lately, bleeding, my ever aching back- I'll be that one you read about giving birth in the back of my Tahoe, alone with my 3 year old ...Anyway, with 3 more weeks till my c-section, this little one is still keeping me on my toes- I'm in for a doozy here !!