Can someone please recommend a Calcium Supplement??

Gabriela • First time mom. 23. Due 06.26.17
I am currently taking a prenatal vitamin that does not contain calcium, probably due to its very small size.
Can anyone here recommend me a calcium supplement that is small in size because I have trouble swallowing big pills. And can I take it at the same time as my prenatal or do I have to space it out?
Thanks!
I am also lactose intolerant.