Normal birth is one of them, and until His birth, it is beyond question that Mary's virginity was unbreached. After His normal delivery, the issue of being born of a virgin is forever settled, and the status of Mary's body is no longer of consequence.
If one wants to force him/herself to believe something of which the Holy Ghost, Jesus, and the Father are silent, and make up one's own unsupported conjecture, that's only backing out into the same briar patch that the Romanists and other cults get themselves into. It's a time-waster and doesn't make sense to me, nor does it jibe with a literal hermeneutic upon which expositional teaching is based.
But as they say, it's a free country.
Place maker
Search the Scriptures and find just one passage where God cheats anyone He has called to His Holy work. IF you find that, I will reconsider what I choose to believe about my God.
Now you've peeved our Predestination FRiends!