I got married during bankruptcy and did not inform trustee? how much trouble am I in?

That depends on which Chapter of bankruptcy you filed, which you have not disclosed here. If you filed a Chapter 7 case, it should not matter at all. However, if you are in an active Chapter 13 or Chapter 11 case, there can be big repercussions depending on your spouse's income and expenses.  Primarily what can happen is that you will be responsible for any increase in your household disposable income from the date you got married forward, so you may end up with a large amount you need to pay at the end of your case in order to obtain your discharge. You should discuss this with your bankruptcy attorney immediately as they are in the best position to advise you on how to proceed, after reviewing all the relevant facts specific to your case.