YOU SAID:
bro guess what my sister is pregnet i am going to be a dad
INTO JAPANESE
お姉ちゃんが妊娠していると思う私はパパになるつもりだ
BACK INTO ENGLISH
I think your sister's pregnant. I'm gonna be your dad.
INTO JAPANESE
お姉ちゃんは妊娠してるお父さんになるわ
BACK INTO ENGLISH
Your sister's gonna be a pregnant dad.
INTO JAPANESE
お姉ちゃんは妊娠中のパパになるわ
BACK INTO ENGLISH
Your sister's gonna be a pregnant dad.
That didn't even make that much sense in English.