I ate food that touched pork

I’m a reverted Muslim and I ate halal food with mustard that pork was dipped in. My first thought was that if I take off the first layer of the mustard it will be okay, cus the pork didn’t touched the rest. But only after I ate I searched on google and I found out that it is najis.. Can someone tell me if I did something haram? I wasn’t sure if it is bad or not, I feel horrible now that I know the truth.