Violated Nda In Job Interview

I had a final interview for an engineering job where I was required to give a “technical deep dive” on a couple of projects I worked on. As the company is in a different competition sphere as my current work, I was very transparent with my explanations. I’m embarrassed to say I even had a prefacing bullet addressing confidential and sensitive information, words I didn’t give much legal weight at the time.

The interview went so well the hiring manager said they were going to make an offer. In hindsight, I realize the HR interviewer wasn’t so all in. They said I should hear back in 1-2 days.

A week goes by and I finally am rejected. I get on the phone with recruiter and find out it was due to violating an nda.

In hindsight and after researching this topic thoroughly, I realize I raised big unethical and/or incompetent red flags. I thought that if there was no competition risk, I was safe. It was an extremely poor judgement call.

So the job is gone and I have a permanent red flag at that company. That’s fine.

Did they contact my company to find out if I had nda? Should I be prepared for this to backfire on my current job? I’m spiraling a bit.