I think I might be pregnant and I am taking vitamins (folic AC 400ug, vit B12 2.5ug vit d 5ug iodum 150 ug zinc 10 mg) I took 2 tablets by accident!?

No problem. The only vitamin that could possibly pose harm would be vitamin a. And you would have to consistently take two much early in pregnancy. There is likely nothing to worry about.
No worry . You will be fine. Don't worry. Just don't do it too many times. When in doubt, always ask your ob.