Still my daughter took from her everything she needed (my wife lost more than 25 pounds).
The second pregnancy started while my wife was nursing so the condition did not start until later (8 weeks) adn we went very quickly on a strong anti nausea drug (the name escapes me but its for chemo patients). She still needed iv fluids but only *really* suffered for weeks 10-16.
The moral is the kid will take what it needs from the mother.
Probably Zofran or Kytril.