I had some shortness of breath yesterday, lower back pain, brown discharge to watery light red, I am eight days late starting my period, and I have felt nausea for the last two days, but I took a pregnancy test three days ago and it was negative. Some mild cramping, but not much at all. I usually cramp several days right before I start and I have felt nothing. I usually have a cycle that last for 28-29 days . It has been 36 days today? can you help me?