Is a urine pregnancy test at Doctor's office 5-6 weeks after unprotected sex accurate?

I had a urine test done at doctors two weeks ago, which wouldve been 5-6 weeks after unprotected sex. It was negative.

Is it safe to assume that this is accurate? I would say passed missed period but I technically did bleed at normal time (heavy and bright red), but I'm on birth control so I know it's not technically a period.

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