does that mean it is a bfp or pfn

Cassie • 🎉🎃🍁🍂 blessed with a beautiful 3 year old boy a 2 year girl and a 9 week girl👨‍👩‍👧‍👦

I just took a first responce pregnancy test and within the first 10 seconds a positive line appeared with the control line and disappeared within 45 seconds and has not stayed, does that mean a positive or negative please anyone xx