The rulings of Talāq e Kināyah are very delicate and intricate.
Whilst it is commendable to learn the jurisprudence (Fiqh), it is neither an individual obligation (fardh al-‘ayn) nor advisable for a layman to study the intricacies. There is a very fine line between accuracy and erroneousness. It is sufficient for a layman to have comprehensive knowledge that is needed in one’s day to day life.
Nevertheless, Talāq e Kināyah is a divorce that is issued in vague terms without clearly uttering the words of Talāq, e.g., the husband says to the wife go away. In this case if the intention was of Talāq then it will occur.
However, if a person uses an ambiguous word without the intention of divorce but there was a discussion of divorce, then Diyānatan (between the person and Allah) Talāq will not occur. Talāq will only occur if the judge passes a ruling of divorce.
If you are positive about not uttering such vague words of Talāq then you should abstain from generating these thoughts in mind. These thoughts are from Shaytān. Also the thought of renewing your nikāh is from Shaytān.
For more detail pertaining evil thoughts follow the link below:
The statement “Nikāh is not made invalid by doubts but can only be made invalid by certainty” is correct and according to the Hanafi School of thought.
And Allah Ta’āla Knows Best
Mufti Zaid M Shelia,
Checked and Approved by,
Mufti Ebrahim Desai.
 كنايته (ما لم يوضع له) أي الطلاق (واحتمله) وغيره (ف) الكنايات (لا تطلق بها) قضاء (إلا بنية أو دلالة الحال) وهي حالة مذاكرة الطلاق أو الغضب.. رد المحتار على الدر المختار 3/296 دار الفكربيروت
 شَكَّ هَلْ طَلَّقَ أَمْ لَا لَمْ يَقَعْ.. الاشباه والنظائر 1/52 دار الكتب العلمية بيروت