Is a doctor's urine pregnancy test accurate for 6 weeks after unprotected sex?

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I had a pregnancy urine test at the doctors office 6-7 weeks after unprotected sex, haven't had sex since then. I was on birth control but missed a pill so I know technically with birth control it's protected but since I missed one I just assume it's not.

It came out negative and I had Nexplanon put in. Would this be accurate? I just want to make sure.

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