If someone has chronic mercury poisoning, how long after removal would it be safe to have a baby?

This has been on my mind lately. I don't ever plan to get pregnant as with my anxiety disorder it would be too much to cope with. At one time I considered it, but now I know about the poisons in vaccines and in food, and that I am toxic, there's no way I would be up to the challenge, mentally, of looking after a child. But, there is no 100% way of preventing pregnancy if one is in a relationship, so it could happen any time. I'm not in a relationship now, but I could be in the future.

What are the thoughts of other women of fertile years here?

As I am 30 now and a vegetarian, would it be better to be sterilized than risk having a baby? I don't want to be sterilized, but I am not sure what to do for the best. I don't want to be single for the next 20 years.