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My test more sensitive than Planned Parenthoods? - test::more plan indefinite

Then Tuesday evening I have a (HPT Clearblue Easy + / -) and read the smallest and thinnest is positive on the left side of the people I met, but to urinate in stick.com is positive. The next day I went to Planned Parenthood, and took a test. It was negative. I do not have my time (because 3 days). She said that sometimes the tests are not as sensitive as SHPT and could be a reason. Is this possible?