Curved line??

Memes • Hi. I am 26 years old and a mother of a 7yr old son. My fiance and I are expecting our second child in Jan. 2018.
Hello. Help please. Ok so I see a visible second line but it is curved for some reason. The last time I got a positive HCG result, the line came out curved as well. I got a blood test and found out it was a false positive. I'm confused. I thought that pink line is supposed to be straight & bold lol. AF is due tomorrow with sign of it yet. Has anyone ever had this happen to them?