Hi lady! Lucky you, I wish I had thick hair :) I myself use micro bonds for lenght and volume, but to be honest if you only use them short term, I can really recommend clip in extensions- there are some really good brands out there who look super real and are really discreet, I tend to use them at times when I dont have micro bonds in and noone is ever able to tell! I wouldnt recommend to get proper extensions done if you only need them for the wedding really-its a lot of money and they need a lot of looking after. Especially if you have thick hair clip ins will blend really well. There are lots of tutorials on youtube as well on how to layer them into your hair.
I have worn extensions on and off for many years if you want some more advice please let me know I will be more than happy to help! :)