I'm most definitely taking cod liver oil this pregnancy as I was deficient in vitamin's A and D a few months ago and am convinced this deficiency contributed to my miscarriages. Since taking it I've experienced such amazing health benefits that I have no plans to stop. Vitamin A from natural sources are not dangerous in pregnancy and can help the formation of your baby's bones and teeth. Not everyone makes the conversion from beta-carotene ( called natural vitamin A in plants) to actual and usable vitamin A in the body, so a fish liver oil containing actual vitamin A not beta-carotene is a good choice.
My one concern is that yours comes from Japan. I wouldn't use anything fishy from Japan if it were me, due to the effects of Fukushima on the sealife there.