If you want to point out that the other person didn't get in touch while you were at the hospital, use this: If you had got in touch with me, you would have known that I was at the hospital / in hospital. If you want to point out that the other person didn't get in touch after you had been at the hospital, use this: If you had got in touch with me, you would have known that I had been at the hospital / in hospital. "in hospital" means that you were staying there over several days to receive treatment.
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If you want to point out that the other person didn't get in touch while you were at the hospital, use this:
If you had got in touch with me, you would have known that I was at the hospital / in hospital.
If you want to point out that the other person didn't get in touch after you had been at the hospital, use this:
If you had got in touch with