Invalid test? Please help!!

So i took this test this morning and after a couple minutes saw only one line and tossed it out. A few hours later i had a weird feeling that i should get another look at the test and this is what i saw! 
Is it possible that i could be pregnant? My husband and i have been trying and getting negative after negative (even when looking back at the test hours later). Our hearts have been so heavy, i just need to know if this has happened to anyone and they have turned out pregnant or if this is just totally a fluke. Thanks ladies!!