no puedo creer in the past and conditional

Question

No puedo creerlo, in the present means, I can't believe it.

If I want to use this in past, imperfect, and conditional tenses, what are the best translations? Here are my best guesses.

(Ayer) No pude creerlo. Last night, I couldn't believe it, but today I CAN believe it.

Yo no podía creerlo. I couldn´t believe it (back in the day, for many years, but maybe now I can believe it).

Yo no podría creerlo. I wouldn´t be able to believe it (for example, even if the aliens landed on the White House lawn, I wouldn´t be able to believe they exist).

Muy agradecido Scott