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Will period blood affect drug test results?

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I'm going to be taking a drug test in two days and the last time I smoked pot was about 2 weeks ago. I've been exercising and drinking tons of water. But I'm a girl and just started my period. The test I'll be taking is a urine test, so blood will be mixed in. Will this alter anything? Since they then can test the blood will they find the THC in the blood?