The answer is: Sixth

Luke 1:26 - while she was pregnant with John the Baptist.

In the Gospel of Luke, we receive a unique glimpse into the extraordinary events leading up to Jesus' birth, particularly through the story of Mary and her cousin Elisabeth. It's fascinating to note that when the angel Gabriel visited Mary during the sixth month of Elisabeth’s pregnancy, a chain of divine happenings culminated. Gabriel’s message was not just groundbreaking; it was steeped in deep theological significance. The angel’s announcement about Mary mirrors prophetic communications throughout the Scriptures, like when the angel visited Abraham to announce the birth of Isaac. Both messages bring forth notions of hope and new beginnings.

Elizabeth, pregnant with John the Baptist, symbolizes the bridge between the old covenant and the new, making her story a pivotal link in redemptive history. John’s role as the forerunner is steeped in prophecy from the book of Isaiah, whose mission was to prepare the way for Jesus. It’s almost poetic how their pregnancies interconnect in God’s overarching plan of salvation.

From a historical view, the timing of these announcements raises interesting questions. In ancient Jewish culture, women’s periods of pregnancy were marked by designations that differ from modern months. Yet, regardless of calendar specifics, the convergence of events at the sixth month resonates with a theme seen throughout the Bible: that God's work often unfolds gradually, leading to significant moments of realization. In doing so, hope is crystallized, and fulfillment of prophecy becomes an enlightening thread throughout these sacred narratives.