Positive one day, negative next.

Maria • Mom of 3 beautiful boys...our princess is due 10-6-16
Took a digital test yesterday and got a BFP, today I took one first thing in the morning and the test didn't work.  Took another 2 hours later and got a BFN.   I'm hoping there just wasn't enough hormone in the 2nd pee of the day, but still unsure what to think.  Help!