to be registered with Mary, his betrothed, who was with child.

English Standard Version
to be registered with Mary, his betrothed, who was with child.American Standard Version
to enrol himself with Mary, who was betrothed to him, being great with child.Berean Study Bible
He went there to register with Mary, who was pledged to him in marriage and was expecting a child.Douay-Rheims Bible
To be enrolled with Mary his espoused wife, who was with child. English Revised Version
to enroll himself with Mary, who was betrothed to him, being great with child.King James Bible
To be taxed with Mary his espoused wife, being great with child.World English Bible
to enroll himself with Mary, who was pledged to be married to him as wife, being pregnant.Young's Literal Translation
to enrol himself with Mary his betrothed wife, being with child.Luke 2:5 Additional Translations ...