7 days late and BFN

Don't know if anybody has had a similar experience and can shed some light on what's going on but I am 7 days late for my period. Had 5 negative tests all taken after I was due. Had a blood test done yesterday which was also negative at less the 1 HCg in my blood... so everything and everyone is telling me I'm not pregnant. 
I've never been late before and I've had all the pregnancy symptoms. I've got sore boobs, nausea, fatigue and the missed/late  period. Don't understand what's going on. 
I also had some pink/ brown discharge about 9dpo. 😬😬 
Anyone help me to understand what's going on??!