I could barely keep basic food down, let alone think about eye color! Don't stress about these things, just focus on keeping yourself hydrated and healthy.
To be practical, eye color is determined by DNA at conception. Don't waste time on home remedies for this, just focus on your prenatal vitamins and staying productive.
Honestly, getting a healthy baby is the biggest blessing. Eye color is purely down to genetics, so don't believe any myths about eating specific foods.