http://www.geocities.com/jinx_o_rama/gena.jpg

" Arya, mouchotto yatta houga yokattakana?" 

"Oh, should I have done a little more?" 

Arya - it's utterance when you are surprised, 
       worried and regretted

Mouchoto - a bit more

houga yoi (yokatta is the past tense of yoi) -
       had better

kana - I wonder if... 

Hope this helps! 

- Keigo