What you described is a molar pregnancy or Complete hydatidiform mole. This pregnancy will not come to term. There will be painless vaginal bleeding and vomiting. On ultrasound there will be the membranes that cover the sac (where the baby should be) but no fetus. There is about a 3% chance that it will evolve to a malignant cancer called choriocarcinoma.
Again, this can happen naturally, it’s rare but it can happen. Of course it would be two sperm cells from the same person penetrating into an empty egg.
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