11 DPO

I took a pregnancy test strip and a faint line came up. It is the evening and I drank about 4 litres of water but I thought what the hey I’ll take one just to see. I didn’t expect it to come up so I rushed into town grabbed a clear blue digital one. Came back negative. Took another strip with the same urine as the clear blue, super faint line. Even fainter then the first one? Confused