Hello girls! Can you tell me who took calcium from the second trimeste…

Hello girls! Can you tell me who took calcium from the second trimester? My doctor prescribed me calcium today with a dosage of 1000mg per day, but didn't suggest anything specific - she just said it doesn't matter as long as I replenish my daily dose. I wanted to order on iHerb website - but don't know what to choose) Please advise.