And, behold, thou shalt conceive in thy womb, and bring forth a son, and shalt call his name JESUS.
Note the "thou." It is Mary who shall "conceive." Now check out Hebrews 11:11. This verse indicates just what is meant by the word "conceive."
"Through faith also Sara herself received strength to conceive seed, and was delivered of a child when she was past age, because she judged him faithful who had promised.
Conceive means to participate in God's process of the Creation of Life. The exact same word, "conceive," is used in both Luke and Hebrews. Both Mary and Sara, "conceived."
Your Lord is far closer to you than you have been led to believe.