أحسن الله إليكم 2 similar questions, I don't suffer from waswas - If I'm 60% sure I'm on my 4th rakaah, and end my salah upon the 4th. Do I perform sujud sahw? - If I'm 95% I'm on my 4th. Do I perform sujud sahw? جزاكم الله خيرا

Yes in both cases. If you lean towards it being the fourth, you build on that.

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