2 negatives with First Response, but no period.?

So my periods are usually 22-26 days. (NEVER over). I am now 4 days late. I've been getting small cramping and weird tingling feelings throughout my uterus and sides with more cramping on the right than left.. Along with a LOT of watery, white discharge. It doesn't itch, smell, or burn.My cervical position has been medium-high for the past couple of weeks, it is also soft, closed, and my (sorry TMI) is literally constantly full of watery discharge. Also my bbs are getting more sensitive about every 2 days. I took a first response early result last night, and today and both were negative. I've also been getting a runny nose, and small headaches every now and then that feel more like pressure than anything. Has anyone gotten a false negative off first response? This is literally blowing my mind. I don't have health insurance so a doctor is out of the question, btw.