HELP! 😅

I'm 9DPO. I tested with a Walmart .88¢ test. I thought I saw a faint line, posted a poll, and (almost) everyone said it was negative. I came back about 3 hours later, and it was definitely not negative. Yes, I'm aware it's "invalid" after the 5-10 minute mark, but I was hoping someone had some experience with a faint line changing to a positive line after the timeframe? Thank you for you insight ladies!