If you're pregnant you should avoid eating the Ceviche because it could harm the unborn baby.
When I was pregnant I asked my doctor if it were okay if I had Ceviche and he said that while I could eat the Ceviche while pregnant that it was not recommended because there's potential to cause complications with the pregnancy and could harm the baby.
It's not worth the risk and I would just wait until you give birth and stop breastfeeding if you do breastfeed and then enjoy the Ceviche.
I've heard of some women who ate ceviche while breastfeeding but it's not recommended.
The ceviche could cause problems with your milk and then could cause harm to your baby when breastfeeding them.
So during breastfeeding or while pregnant avoid eating things such as the Ceviche until you're done breastfeeding or given birth.
It's not worth the risk of harming your baby or harming the pregnancy.