Digital Yes then No

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Hubby and I are TTC, took this last night. But I took the same brand and digital again today and it was negative. I took a first response regular dye one a few minutes ago and negative again? Has anyone had this happen and still be pregnant??