Haven't tried sea bands myself, but a few of us mums in our group chat have, one swears it helped her during her first trimester, though honestly she said it wasn't a total game-changer, more like it took the edge off the really bad waves kaya hindi siya umuubo every few minutes. It's worth a try since it's non-invasive and safe, at least, so walang risk kung gusto mo lang subukan habang nakikipag-consult ka rin sa doctor about the nausea, some moms find ginger, ice chips, or even just frequent small meals work better para sa kanila anyway.