YOU SAID:

Haven't heard from you in a couple of months

INTO JAPANESE

数か月の間あなたから連絡がありませんでした

BACK INTO ENGLISH

I haven't heard from you in several months.

INTO JAPANESE

もう何ヶ月も連絡がありません。

BACK INTO ENGLISH

I haven't heard from you for months.

INTO JAPANESE

何ヶ月も連絡がありません。

BACK INTO ENGLISH

I haven't heard from you for months.