Is this even possible?


So my best friend got two faint positives with blue dye tests and one looked a little iffy. So she came to my house and used 3 pink dye strip tests with the same cup I used to take my tests months ago and has been washed but she got all 3 positives from 2 different pees. Well next day she got only negatives with the same pink dye strips and then bought more and negatives still and then bloodwork also negative. So I’m wondering would my cup really transfer hcg for her to get positive tests? It’s been months since I’ve used it and like I said it’s been washed! Super weird though!