Yes, you have to use first morning urine, especially if it's early into the pregnancy, that is if you're pregnant.
So you don't know how late you are, you just know you're late? It can take some women months to get a reliable reading from a store bought pregnancy test. False negatives are very common because most women test too soon or don't use first morning urine.
Wait another week or two and if you still haven't gotten your period than test again, and this time use first morning urine. If that test is negative than wait until your next period is due, if it doesn't come than test again with first morning urine, or see a doctor for a more accurate blood test.
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