Hey mama, kailangan mo talaga ng calcium during pregnancy kaya good thinking! Pero since maraming brands at formulations out there, mas better kung itanong mo sa OB mo kung okay yung specific one na nabili mo, baka may ingredients na hindi ideal for you or baka may better option depende sa prenatal vitamins mo na. One of my mum friends nag-mix ng supplements without asking her doctor and it caused some issues, so better safe na lang talaga!