Hiv anxiety

My health anxiety has been taking off lately and I’m stuck on a previous” exposure “ 

I am not a person that sleeps around and due to my health anxiety I am very cautious . I don’t know why but lately I’ve been worried an old test result could be wrong .  I took an std test including bloods for syphillis, hiv , hep a b and c and all was negative at what I thought was 12 weeks post “exposure “  upon counting the days I realised I actually tested at 80 days not 90 . I am reading conflicting advice on the internet that nothing is conclusive until after 90 days . 

Do I need to re tests . I’m in Australia and I’m extrmely nervous sad 

I thought it was 84 days that’s 12 weeks I tested negative and I’m I’m in England I’d say your tests are conclusive mate relax what are your symptoms however?

No symptoms buts I’ve read plenty stating symptoms don’t always present .