Pregnancy tests

Kati

So I took a test last night and it immediately showed up negative. Threw it in the trash, now today probably 24 hrs later I go to take out the trash and see the test sitting there and now there is half a blue line that would indicate pregnant but not sure if I’m just getting my hopes up since the instructions say to discard after so many hours.... anyone ever have a negative test that turned positive 24 hrs later?