Slightly Concerned.

So my period is well over a week late. The only potentional pregnancy signs I've had are kinda sores breasts, some cramping and when I wiped the other day their was a slight pink on the paper. 
I took a test late last night with the help of my SO and it came back negative, but then this morning while making breakfast I had a random spout of nausea so bad I had to lie down. 
I don't know what it is and my period is never this irregular. Should I test again in the morning or make a doctors appointment? Has anyone tested negative in the beginning? Because that's what my SO is thinking that the test was wrong. 
PS it was a clear blue digital test.