Is there a possibility to get a false negative pregnancy test when drinking water all day?

Yes. If the urine is too dilute the test may not recognise the minute amount of hormone (HCG) in the urine. That is why we prefer a first voided urine in the morning.

Related Questions

Possibility of false negative pregnancy test 36 days after intercourse? Also on birth control and used condom but am having spotting and heavy cramps.

No. So all you need is to be off on bcp, have condom fail, be in ovulation window, and have a swimmer find egg? If still worried, can always re-test, but should not be due to pregnancy. Read more...
Technique. If you did the test correctly, and it has been 36 days since you had intercourse, you are not pregnant. You may repeat the test using first morning urine and following the instructions in the kit carefully. Or, you could see your doctor for a more sensitive blood test. Read more...

What's the probability of having a false negative pregnancy test when my period is 3 days late?

Not inconceivable. Sorry but pun was intended. While home pregnancy tests are fairly sensitive, some women will have a negative test early on during pregnancy. So if you've been engaging in unprotected sex and your test is negative 3d after being late, then repeat test once you're a week or two late. By 2 wks late or 6wks after last menstrual period, home pregnancy test should be positive if you're pregnant. Read more...

What are the odds of false negative pregnancy test while breastfeeding?

Pregnancy Tests. Pregnancy tests are designed to look for the presence of beta-hcg which is a hormone produced by a conceptus and acts to maintain a pregnancy. The level rises very quickly after conception and can be detected as early as 1 week after conception and almost always by 2 weeks after conception. False negatives occur during this 2 week period. Breastfeeding does not impact this hormone. Read more...