tuns as calcium supplement?

FirstTimeMom💁🏻🤰🏻🤱🏻
Just discovered my nature made prenatal doesn't only gives me 12% of my daily needs calcium 😱. My doc won't see me for 1st appt until Jan 23rd and I'll be 9 weeks by then. How have you been supplementing your calcium? 
We have tums at home already can I just eat one of those daily ?
I do drink 1 cup of milk and eat a yogurt daily, but adding it up I'm still majorly lacking in calcium 😞 thought I was doing so well with my food choices. It's my first pregnancy and am so nervous of not doing the best I can for the baby😳