Foods that should not be eaten in early pregnancy. Early pregnancy is a critical period for embryonic growth and development. Many foods will have adverse effects on the embryo. Here are the foods that pregnant women should avoid during early pregnancy. 1. Raw fish: Raw fish meat contains a large number of parasites and bacteria, which can easily lead to food poisoning and pose a threat to fetal health. 2. Raw meat: Raw meat contains bacteria, parasites and other harmful substances. Ingestion of raw meat can easily cause illness in pregnant women and fetuses.