YOU SAID:
I am pregnant with your grandmother
INTO JAPANESE
私はあなたのおばあちゃんと妊娠しています
BACK INTO ENGLISH
I am pregnant and your grandma
INTO JAPANESE
私は妊娠していてあなたのおばあちゃん
BACK INTO ENGLISH
I am pregnant and your grandma
That didn't even make that much sense in English.