Signs labor is closer than expected?

lala

I've had sex at about 33wks and no bleeding spotting or cramping. I went to the doctor today at 36wks and got my first cervical check where I was 1cm dilated and 60% effaced about 4hours later I wiped and got some brown tinged discharge. Had some tingling and cramping on the right side of my back nd every time after I went to the bathroom after which has been three times now I still have brown discharge... are these early signs of labor?