Chemical pregnancy

3 days ago i got faint line (pink and thick). But i wasn't sure of the time frame cause i was just going to throw it like usual, without checking it. But i can assure it was no longer than 20 mins. Suddenly a faint line appeared, which make sense of changes i felt in my body, weird ones. Then this morning, i got my period and suddenly my symptoms all went away. So i dont know. I think this might be chemical pregnancy??