6 hour LH surge - does this look positive?

Question

LH surge - does this look positive?" /> 
Is it possible to have an LH surge that lasts only a few hours? This is my second month tracking; last month I tested positive for closer to 12 hours. CD15 is the darkest I’ve gotten this cycle and both Glow and Premom categorized it as my peak. Looked positive in person too!

Answer

Update: just in case somewhere else experiences this and is looking for answers(!), I got a strong positive today 😊. CB digital started off negative this morning as well, but positive by mid-morning.