Yes you can eat cooked oysters when pregnant.
When pregnant you can safely eat cooked oysters as long as the cooked oysters are fully cooked.
So just make sure the oysters are fully cooked all the way through before eating them when pregnant.
Because if you do eat oysters that are not fully cooked when pregnant there could be bacteria that could make both you as the pregnant women sick and also cause the unborn baby to become sick.
So as long as you make sure the oysters are cooked all the way through you can safely eat the cooked oysters when pregnant.
I ate cooked oysters when pregnant and both me and my babies were and are just fine.
I asked my doctor if it was safe to eat oysters when pregnant and she said it was as long as they were fully cooked.