9 days late...pregnancy symptoms but negative tests...help!

My period is 9 days late, I started to experience symptoms of my period coming the day before it was due. Since then I have had tummy cramps, very bad lower back pain, spots on my face, being emotional, thrush (I read this is a pregnancy symptom due to change in hormones), living between having a loss of appetite to eating everything and more tired then usual. I have done a couple of tests which have come back negative... What should I think... It's driving me mad 🙁 xx