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If you eat some oily fish every week, you probably won't need to take a supplement.
Government advice is that we should all eat more fish, and up to two portions a week can be oily fish.
Crab and prawns contain reasonable amounts of omega-3 fats.
And white fish, such as cod and haddock, contain some omega-3, but in lower amounts.
However, if you feel well and have discussed it with your GP, there's no reason why you can't travel during this time.
Most airlines will not allow you to travel after week 36 of pregnancy, or week 32 if you're pregnant with twins or multiples.
Some research suggests that babies born to women taking omega-3 long-chain fatty acids weigh a little more and are less likely to be born early, but more research needs to be carried out to be sure.
Oily fish will provide you with plenty of omega-3 fatty acids, as well as other vitamins, minerals, and protein that you wouldn't get from taking just a supplement.
Some research has shown that in countries where pregnant women tend to eat more fish, fewer develop pre-eclampsia, or have a baby who is premature, or a low birth weight.
However, cod liver oil also contains high levels of the retinol form of vitamin A.
You shouldn't take supplements containing the retinol form of vitamin A when you're pregnant, because large amounts of retinol can harm your baby.