Confused

Kristina Marie • 24, married, have 2 kids & pregnant!
So thursday i took a test and it was negative the last night i took the top two and then when I got home today from work I took the bottom one that is lighter and just confused on why it's so light compared to the other ones. My af was due today and didn't show. Could it be just because it's a different brand or that because I took it in the middle of the day? Anyone else had this?