Did I invalidate my grandfather’s funeral prayer by reciting Bismillah after Sana?

I want to ask that I was leading the funeral salah of my grandfather and by mistake I recited Bismillah Hir Rahman Nir Rahem after the sana and then recited durood and then the dua of a funeral salah. Is the funeral prayer valid if not then now what can I do for repentance. Please answer ASAP I am worried about it.