Yes, this is normal. When you are pregnant, your whole system goes slightly haywire. There's another person in there, who takes up a lot of room and makes it harder for your digestion etc to work as normal.
As long as it's not anything which stops you eating, or makes you feel ill, I wouldn't worry about it.
Have you thought about carrying a pregnancy pack, with things like a couple of baby wipes and a toothbrush, some water, and some dried fruit to nibble when necessary?
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