Я звонила вам вчера около шести, но

Я звонила вам вчера около шести, но никто не ответил. - Должно быть, я выходила за хлебом.

Results (English) 1:

I called you yesterday about six, but no one answered. -I must have went out for bread

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Results (English) 2:

I called you yesterday about six, but no one answered. - I must have come out of the bread.

Results (English) 3:

I called you yesterday about six, but no one has responded. - There should be, I went to buy bread.