Question: How to plot contourplot for 2 parameters involved in System of Differential equations?

I want to plot a contour plot for variation of 2 parameters involved in the system of differential equations.

dsys6 := {x(t)^2 + n*y(t)^2 = 1, diff(x(t), t, t) = -2*m*x(t), diff(y(t), t, t) = -2*m*y(t) - Pi^2, x(0) = 0, y(0) = -1, D(x)(0) = 1/10, D(y)(0) = 0}

Here I want to plot the m vs n plot of y'(1).
 

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