If ex husband filed bankruptcy and house is in both names, will I have bad credit now?

As long as you continue to pay the mortgage on the house, the mortgage company cannot take your house away. I would suggest that you check your credit report & FICO score 3 or 4 times a year for the next two years. It is very likely that the mortgage company will report on your credit that the debt is in bankruptcy, which is true. Should the mortgage company report by mistake that you are in bankruptcy, you should immediately dispute this claim. By checking your credit score with FICO (the only company that creditors use when making a decision whether to lend to you), you can see if any misinformation has harmed you and get to work to correct it.

Without more facts, we are not able to advise you or answer your question. The debt will be discharged as to him, and the mortgage company will eventually foreclose if payments are not made. Since you are not on the loan it should not affect your credit.