wouldn't Mary have been guilty of a) fornication since the "sperm" was not Joseph's or b) adultery (since she was engaged)?
According to the Bible, Mary became pregnant by the HOLY Spirit. Also, there was no sexual relations involved with organs.
Boggles the mind God’s greatness who could have easily selected any single female but God chose Mary and didn’t intervene by not having her get engaged to Joseph.
Also, a single pregnant by the Holy Spirit woman would be ostracized besides nobody would marry her in that malelish society back then. And, Jesus needed a step for obvious reasons. One reason is for the “legal right” to the throne of David.—Isn’t God magnificent?