A Small Mistake During Salah
Your Salah would be valid, you do not need to do anything else except for performance of Sajda-e-Sehav at the end. Sajda-e-Sehav can be done at a later point even after the prayer, as soon as one remembers that they were supposed to perform it. Please refer to the following thread to see details regarding Sajda-e-Sehav : Discussion 62524