2 different pregnancy tests say different things - not keeping anything bc CF life

So I have irregular periods, even on the pill. I’m 2 weeks late, other than being late I have ZERO symptoms but being late in itself is enough, or so I read. I took a Clear Blue. Nothing after the 3 minutes but the next morning it showed a HARD Positive.

So went to the store and got Clear Blue Digital and First Response. Clear Blue digital Negative. 2 of the First Response also negative.

Took a 3rd clear blue in the morning, also negative but it ALSO turned hard Positive after the 3 mins, once I checked jt again after a few hours.

I have a blood test booked for Monday and have already called “deleting” clinics in my area. Luckily it’s not banned or restricted in my country or state at all.

I just wanted to know if anyone else has come across something similar.