Is it possible to get a (true) positive and then it go away?

Tara • 25 years old. TTC #1 since 7/2018 with my husband of 3 years. ❤️

I’m 12 DPO. I took an Easy @ Home cheapie test. I SWEAR there was a line a couple minutes in. After it dried completely, it was totally gone. Is it most likely I was just going crazy? lol. I have some FRER tests, but I’m scared to test with those. 🙈