Pregnant??

*UPDATE* I took another digital later on this evening which shown 'pregnant 1-2 weeks' so happy! Thought I was completely out this month after having complete negatives up until today. Also had no symptoms, just goes to show that everyone is different! ✨

I'm 13dpo today, period due tomorrow. I took a cheapie this morning which shown a very faint line so I took a First Response at lunch time which I think shows a faint line? I have just taken a clear blue test which said 'not pregnant' so I'm confused? Could it be because I didn't use Fmu? Pic below.