I know that home tests get more accurate each and every year, but please keep in mind that they're not foolproof... at least not yet. I had a false negative test on the pregnancy I lost and it's haunted me ever since. "Negative test result, so the nausea must be something else".... at least that seemed reasonable at the time. (Cycle had never been regular, so that wasn't a factor in my case.) I have always wondered if things would have turned out differently had the test indicated a pregnancy... I surely would have gone right to the doctor and started getting medical care... so I'm thinking it may have indeed made a difference.
False negatives are actually much more common than false positives. Come to think of it, I don't believe I've ever heard anyone telling a false positive story.
There are a few reasons for false negative readings.... one being taking the test too early... which wasn't the reason in my case. Another reason is simply a flawed test.
All this to say that if you feel you're pregnant and get a negative reading, take another test in a week or so or have a doctor do a test. It's very important.