30-pin Doc Connector-Potential Problem iPhone 4

Hello,
Today I inserted my charger into the 30-pin doc connector and the phone
started to charge normally. Usually when the charger is not fully plugged in
I push it in a little more so that it has fitted all the way in. I thought the charger
had not gone in all the way (when it had) and I pushed it in more three more
times with a little bit of force. Nothing happened and the phone charged just
fine and everything was normal.
My question is,
1) By additionally pushing in the charger, have I in any way
damaged the 30-pin doc connector?.
2) Should I be concerned for the future?.
3) How can a pin doc connector possibly damage? (ie by pushing or bending etc?)
Thanks
PA
iPhone 4 iOS 4