Arusip and fresh seaweeds are generally okay during pregnancy, pero mas safe kung cooked well and from trusted sources talaga, raw or undercooked seafood can carry bacteria na hindi maganda for baby. The bagoong isda should be fine too since it's fermented, but I'd still ask your OB about how often and in what amounts, kasi some doctors prefer limiting high-sodium foods during pregnancy. A few of my mum friends ate seaweed dishes the whole time with no issues, pero basta sure na fresh and properly prepared lang, at washed thoroughly para walang harmful bacteria!