do you keep on pushing?

[NetSapiens]

the situation: 5 players left, I'm short stacked and in SB.

For the purpose of this discussion, assume that pushing with ranges Ax is correct.

in SB I got A4 and pushed. All folded
On Button I got A5 and pushed. All folded
I then get A7 and I suddenly had my doubts. Is it proper to continue pushing repeatedly? Or is this a case of folding for image value even though it might be proper to push?