The accuracy of pregnancy test kits is 99%. Once you buy pregnancy test kits, it can be used to detect the hcg levels present inside the placenta and shows the results accordingly.
When can it go wrong?
There are 3 cases when the pregnancy test kits can go wrong.
1. When it is tested too early after missing your period. It is best to take the test after one week of your missed periods to avoid inaccurate results.
2. During a rare case called "Biochemical pregnancy", which has rarest possibility.
3. You drank a lot of water before the test, which might have diluted the urine and hence the results might be negative.
Fake positive result
A fake positive hCG pregnancy test is an incorrect result which shows you are pregnant, while you are NOT pregnant.
Fake Negative result
A fake negative hCG pregnancy test is an incorrect result which shows you are NOT pregnant, while you are pregnant.