Take a good quality fish oil but from fish body not liver and make sure it’s deep sea fish such as sardines and anchovies. Eskimo is a good brand as is nfc essentials – http://www.thenaturalfertilitycentre.com
Here’s an organic and vegan option. Safe for pregnancy and helps support reproductive health. There are no metals (because it’s vegan) therefore no risk of mercury exposure. (I am affiliated with this link, I wouldn’t be with anyone else!) Many thanks! Best of luck on your journey!