Help- first response hpt users! Positive???

Thought I would post this here since you all have had BFPs!!!  I am DPO 14 with AF due today.  I've had BFN with cheapies as recent as this morning.  I just did this test with First Response (held for 4hrs) since AF hasn't shown herself.  Problem is it looked negative initially so I forgot about it.  About 10-20 minutes later, I remembered and checked it and it looked like this.  Have any of you had this happen so late?  Is it possibly an evap line then since this is waaay after the 5 minutes recommended?   Stick still looks the same an hour later.  I'm afraid to get my hopes up....