"I am 8 days late on my period and I started having a yellowish discharge, then it turned into a white discharge. I also have really bad cramps. I took a pregnancy test and it was negative."

Wait another week and if you don't get your period, test again for pregnancy. It could be that it was just too early to test. Make sure you follow the pregnancy test directions exactly.

You could also go to your doctor for a blood test.