It is known to concentrate in the ovaries; and presumably if it reached a fetus it would behave similarly. So it is worth asking, does the spike protein, or worse, the mRNA itself (whether free or still in the lipid nano-particle) cross the placenta? Some lipid nano particles can cross the blood brain barrier, so it is an open question...

AFAIK the mRNA should not contain the spike protein, but it will contain other protein, if it contains the spike protein to kill the cancer cell this is very, very bad...