Disappearing test lines

Arica

Hello mamas! I’m TTC baby #2 and the last 2 days I’ve gotten vvfls that appear and STAY within the test development window but they’re very pink. Definitely not an indent though because I’ve seen them get darker. HOWEVER when I go back to show my husband or to just stare at the lines they’re usually gone... are they bfps but I’m really early? Or are they false readings? I feel like I’m going nuts. I’m 10 dpo. Thanks in advance for any advice or help!