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test kit are nearly 97 to 98% accurate. I advice you to do the test week after missed period. If you have done it there might be chances of false negative result. So repeat the test if you have done it earlier.
I also advice you to use the early morning urine sample to test as it has more sensitivity. Depending on the result you can take the next step.
It is better to use one or the method of contraception
if you are not planning to be pregnant.
Hope i have covered all queries.