Do pregnancy symptoms have an evolutionary advantage?

What do you guys think the evolutionary advantage is of first trimester pregnancy symptoms? Like fatigue, nausea, food aversions?

Nausea and food aversions make sense to me, as an evolutionary advantage, to protects against food poisoning. Thinking about nausea this way helps me feel better about it. It feels more purposeful.

Why all the fatigue? I want your hypotheses! Would fatigue be advantageous in preventing risk taking? Would fatigue ensure that you rest and don’t use up too many calories?

What are your thoughts?