An aromatic pairing of chamomile and ginger, Urban Moonshine Calm Tummy Bitters ($19) helps and calm occasional upset stomachs and nausea. It can be taken straight-up with a dropper or added to your ginger ale or other drink for an extra boost.
These bitters also contain dandelion root, which has been shown to be an appetite stimulant, something many of us need when we are trying to "eat for two," but are having a hard time stomaching something as simple as a cracker.
Note that this product does contain a small amount of alcohol, so it is best to check with your doctor before you incorporate it into your lifestyle while expecting.