Question about pregnancy test

Is it possible to have a very faint positive and not be pregnant? My period isn't suppose to start until August 30th. I took a pregnancy test yesterday and it was negative. I took one this morning and there is a very faint positive. It is a first response test that is suppose to tell you 6 days before your missed period.

Don't want to get you too excited, but there are girls here that had very faint positive lines and then got their darker positive when af was due. I hope this is also your case. Good luck :)