Negative and still been pregnant ?

Hey everyone… I’m currently 5 days late for my period. I have only ever been late when I’ve been pregnant, and I otherwise have an extremely predictable 28 day cycle. I’ve had sex with 3 different men this month, however, I used protection. I have no indications of my period aside from extremely swollen, sore breasts and fatigue. I’ve not really had any symptoms of pregnancy either.

I’ve had 2 negative clear blue rapid result pregnancy tests. Which I took 2 days ago. I had negatives with my other two children until I was 2 days past my missed period, but I’d have expected if I was pregnant it would’ve showed a positive by now.

Has anyone had negatives with this brand and still been pregnant? I’m extremely worried. I have an appointment with my GP tomorrow.