I accidentally take 2 hemarate FA in a day.

Wag kang mag-alala, hindi naman ganun kalaki ang risk na mangyari. Hemarate FA is just an iron supplement, and while taking too much iron in one go is not ideal, usually hindi naman ito magkakaroon ng harmful effect sa baby, lalo na kung hindi ka naman regularly nagdo-double dose. Pero mas maganda pa rin kung i-monitor mo ang sarili mo. If you feel any discomfort like nausea or stomach upset, let your OB know. Always better to be cautious, pero most likely, okay lang yan.