Second trimester nausea ?

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For my first trimester I was so nauseous but didn’t throw up. After my second trimester began it all kind of went away except for certain food aversions I still have. But today I am feeling very nauseous randomly, doesn’t help my baby boy is kicking very actively. Is there any reason for this random nausea starting up today? (Not looking for a medical diagnosis, just wondering if anyone went through this and if it’s maybe normal.)