TMI PIC

Since like 7 this morning ive had tons of pressure and my back has been hurting. And earlier i swear i had some contractions bc i kept cramping really bad and my stomach would get hard and feel like it was being squeezed and stuff and then i got home and laid down and took a nap and the cramping stopped but my back is super sore and still alottt of pressure. And then i went pee and this brown stuff came out but my sister said to call the doc and i dont want to bc i dont think its anything but she said thats how she was when she started labor but i know their gonna say wait till ur contractions are 5 min apart lol. What should i do?