The vaccines for Covid are experimental. They have not been tested on pregnant women and have not been tested long term. They also are not FDA approved. The reason they are available is because they received emergency approval not because they passed animal testing or long term testing.
Animal Testing skipped,
There are several things we don't know about these vaccines. Why shouldn't pregnant women get the vaccine? Could the vaccine cause sterility? Could the vaccine cause antibody dependent enhancement? This vaccine is experimental and has never been used on a human being before 2020.
After WWII 23 German doctors were tried for experimenting on human subjects without their consent. Of the 23 defendants, seven were acquitted and seven received death sentences; the remainder received prison sentences ranging from 10 years to life imprisonment. Their crimes involved everything from freezing subjects to dropping objects on their heads and everything between.