Missed Aunt Flow..

I missed my AF last month and didn’t think anything of it. I was on vacation so I didn’t bother to test until after we got back yesterday. I tested with a Dollar Tree test … again I didnt think anything of it AT ALL. It was SUPER positive before my eyes and Im in disbelief. I’m wondering why Dollar Tree test is darker than the Walgreens one I took today. Still can’t believe it