NEGITIVE 😭

Sucks 😩 every test I take is negitive .. I always think am I doing it wrong ?? What's the deal here ?? I've been feeling nauseous for about a month . My last last period was 3days Early and only lasted 3 days normally same time every month 6-7 days .. My next period should be in about a week . Took a test last night thinking hmm maybe I can try and see what it says .. Negitive.. Breaks my heart .. I've been trying for 3 years ..  Any advice??