How long can it take to test positive?

[starlightmagic]

I was due on the 7th/8th have had some cramping but no bleeding whatsoever. Boobs still very sore. No spots which is very unusual for me around AF.
Tested yesterday morning with a Sainsbury’s test that’s been sat in my car for 6 months and it was negative. Could conditions in my car have caused this?
I’m so confused

It's possible, ideal storage is between 4 and 30 c on my pack so it could have been damaged in the freezing temps. I'd get another and test again.

It definitely went below 4 degrees! I had no idea thank you I’ll go to the shops!!

When I was pregnant with my ds I did loads of supermarket tests and they all came up negative. One day after my missed period I decided to do another test but bought a clear blue as it was all they had in the shop and it showed 2-3 weeks pregnant.

I don't think the supermarket tests are as sensetive and so can give false negatives. I'm also doing stick in a glass of pee this time instead of wee on stick so to be sure it gets a proper soak.

Get a new test. Not a Sainsbury's one.

Took me until 19 dpo!