Help?

My sister and I both took pregnancy tests today. Both appeared to be negative, but I felt super weird about mine and I swore I could see something TRYING to show but not quite because I’m only 7dpo. I took mine about an hour before she took hers. So mine was about 3 hours ago, hers was about 2 hours ago. I know they’re invalid after 10 minutes, but hers is still completely negative and mine now has a line. They’re both the 88cent Walmart ones. I’ve never had an evap line using them. Do you think this means anything?

Obviously I’m gonna wait at least a few more days and keep testing probably for the next week to see what happens but it just seems odd to me.

*Please don’t be disrespectful, like I said I know they’re invalid at this point