What happens if you use a credit card listed on a ch.13 bankruptcy for groceries after you have filed?

Filing for chapter 13, and I used a credit card after the filing, for groceries. After this I found out I am not supposed to use that credit card at all. I always paid it in full each month. I'm trying to save my house that is the only reason I'm filing. I make over 200k a year but my loan is killing me. Will the court think I'm screwing around? I mean it was for groceries....nothing else. I have since then stopped using it, but what's the worse that could happen