Multiple invalid tests.

[cathxxx]

I am 5 days late, I have taken 3 different pregnancy test all invalid. Why is this happening? Nothing showing up at all not even in the control box. This was with Tesco tests and clear blue. Has anyone else had this. I am getting cramps however they are coming and going with absolutely no sign of a period coming. Why am I getting invalid results surely not all 3 tests are broken? And advice or help would be lush xx

Perhaps you had late ovulation which has delayed the start of your period?

are you peeing on the stick or dipping the test into a container of urine? If youre peeing directly on the stick you could be flooding the test?