You're basically going to have to choose one of three options,
Either try to solve the geo like this, diverting it into two triangles:
Or just let the subdivision sort itself out. It all gets turned into quads when you apply one level of subdivision anyways.
Personally I think the latter looks better.
None of it really looks very good IMO though.
Consider whether you even need to do this, if you really need that geo there then maybe you can apply an additional level of subdivision over the entire mesh and then work from there with your new geo. Trying to insert too much manual geometry into a mesh starts to get distorted and shitty quickly. All of the options from above result in something far worse than this option.