If the over-the-counter things/foods do not work, I would ask the doc for Zofran ( generic: ondansetron). Given the FDA category as not known to affect the fetus and for the success stories I have heard of it helping with the n/v, it is what I would ask for if the other things did not help.
They should be happy to call in the other for you if you decide to go this route instead. Take good care and hang in there. Know that it will pass.