It's a possibility. You can go to your Dr., or you can just wait a while and try again. I took a pregnancy test that was negative after I was about 2 weeks late. I felt symptoms, so I waited about another week or so and took another test, and that one was positive. My daughter is now almost 11 months old, so obviously that first test was wrong! The doctor told me that home tests almost never give false positives, but they can give false negatives. I'd just wait a week or so, and maybe try another brand of test. But if you really want to be sure right now, a blood test is the only way to go.