Any ideas

Bre

So my cycle is supposedly due tomorrow but, all I've had so is bad backaches...I took a pregancy test last night to see that it was negative, but everyday I go to the rest room I'm noticing it's more cervial muscs than before it's clear but stringy, can anyone tell me what this may mean? Did I test too early? Or could my cycle be on its way.

.I have very very bad backaches and cramps all of a sudden...