Is Sushi, sashimi, raw shellfish, oysters, ceviche safe during pregnancy?

In short, according to public-health guidance, sushi, sashimi, raw shellfish, oysters, ceviche is best avoided during pregnancy.

Why

Listeria, parasites, Vibrio — risk of infection/foodborne illness

What to do

cook to 145F/63C

The rest of the guidance

Most people checking one food have two or three more in mind. Here is the whole list, strictest first — each verdict is the same one published on that food's own page.

All alcoholbest avoided
Rare/raw beef, poultry, pork; undercooked eggsbest avoided
Raw alfalfa, clover, radish, mung-bean sproutsbest avoided
Shark, swordfish, king mackerel, Gulf of Mexico tilefish, bigeye tuna, marlin, orange roughybest avoided
Unpasteurized (raw) milk; soft cheeses: brie, camembert, feta, blue, queso frescobest avoided
Unpasteurized/fresh-pressed juices, ciderbest avoided
Albacore (white) tunabest limited
Coffee, tea, cola, energy drinks, chocolatebest limited
Liver, pate, high-dose vitamin A supplementsbest limited
Unwashed fruits and vegetablessafe when washed well
Salmon, sardines, shrimp, pollock, catfish, tilapia, canned light tunaencouraged
Deli/luncheon meats, hot dogs, pate, refrigerated meat spreadssee page

Source: MedlinePlus: Listeria Infections (U.S. National Library of Medicine).

Educational reference from public health guidance; not medical advice — consult a clinician/pediatrician.