1: Diary products
Diary products contain calcium and vitamin D , vital for supporting the bones and badly functions of the baby and mother.
Those who are sensitive to lactose can eat Greek yogurt , which also contains friendly bacteria. Supplements with probiotics (friendly bacteria) can eat protect against gestational diabetes preeclampsia , infections , allergic disease and prevent excessive weight gain during pregnancy

2: Eggs
It is recommended that Pregnant women consume about 450mg of choline a day . One egg contains about 133mg of choline or 25% DV of Choline . Choline plays a critical role during fetal development , it helps build a strong and healthy spinal cord and may be responsible for memory function throughout the baby's life .

3: Sweet Potatoes
Vitamin A is crucial for the growth of a healthy fetus . It's recommended that Pregnant women consume about 40% more vitamin A while pregnant . One cup of baked sweet potatoes contains 769% of the recommended DV vitamin A or beto-carotene.
Fibre in sweet potatoes can improve strictly and keep blood sugar from spiking which can help with pregnancy craving and manage gestational diabetes.

4: Legumes
Women typically don't eat enough folate during pregnancy.
Adding legumes to their die can boost folate levels and prevent problems like low birth weight and neural tube defects.
Folate deficiency can also make the child more likely to contract diseases later in life

5: Salmon
Omega 3 fatty acids are crucial building blocks for a babys brain and retina, three ounce of wild Atlantic salmon contain more than 2000 mcg of omega 3 fatty acids .
Salmon is rich source of vitamin D. Wild-caught salmon contains more vitamin D than the farmed

Source http://meduhealth..com.ng/2017/06/13-foods-pregnant-women-should-eat.html

: Lean Meat
Lean cut beef , pork, and Chicken provide iron, protein, choline and vitamin B
As a pregnant woman, blood volume increases so as for her demands for dietary iron , especially in the last few months of pregnancy. Getting insufficient iron during the early and middle stage of pregnancy can cause iron deficiency anemia. This content increases the risk of premature birth and low birth weight.

7: Dark Leafy Green Vegetables
Eating leafy greens can add important nutrients. Intake without adding many calories consuming green, leafy greens vegetables has also been associated with larger birth weight and head circumference in infants.
If you cook the leafy greens, you'll typically end up consuming more than if you eat them raw . This can help boost the amount of fibre you eat preventing constipation which plagues at least 25% of pregnant women.

8: Berrie
Berries are full of water antioxidant and vitamin C . Vitamin C help you absorb iron , if you experience iron deficiency during pregnancy, eating meat alone with some berries may help the anthocyanins, blue berries may also help regulate blood sugar and insulin sensitivity . This can make them an ideal snack if you have gestational diabetes.

9: Fish Oil
Fish oil is often taken as a supplement it is derived from fish livers and is rich in omega 3 acids .
Fish oil also contains source of vitamin D , Pregnant women who don't consume enough vitamin D bmay be more likely to develop preeclampsia high blood pressure caused by the pregnancy.

10: Avocados
Avocados are high in mono-unsaturated fatty acid fibres folate vitamin K and Vitamin C. One Avocado contains 20% DV of potassium which is more potassium than bananas . Regulating potassium balance in the body may help prevent leg crampus which are common bin pregnancy

11: Whole Grains
If you are having trouble taking bin enough calories, while pregnant , you can take grains have more fibre and nutrients than their refined counterparts.
If you don't eat meat or have an aversion to it during pregnancy, eating oat or quinoa can help you satisfy dietary protein requirements.

12: Dried Fruits
Dried Fruits is high in calories and sugar , but it contains a great deal of fibre .
Studies shows that eating dates in the last three months of pregnancy can help your cervix dialate fascinating labour

13: Water
A woman's blood volume increases significantly when she is pregnant , that makes it even more important to stay hydrated during pregnancy . Drinking enough water can prevent you from getting urinary tract infections an uncomfortable side effects in some pregnancies .

Quite informative