My doctor said accuracy improves a lot once you reach your missed period date. Two weeks is borderline and can miss it. If you test early and its negative but period doesnt come, retest in a few days.
I tested way too early once and the single line just made me spiral for days. Then it turned positive later. Honestly save yourself the stress and wait for the missed period.
At 2 weeks after intercourse its often too early, hCG may be too low to show. You can easily get a false negative. Wait till your missed period for a reliable result, then test.