You don't need to see a doctor before your first OB visit unless you feel there is something wrong. If everything is plain sailing you will then visit your OB every month until the last 8 weeks I think where it increase to fornightly then weekly.
Last time I was just on Folic acid tablets until I visited my OB who recommended the likes of Elevit or Blackmores Preg tablets - consequently I'm just taking them from day dot of finding out I'm pregnant as is a friend of mine who's pregnant (and a midwife).
I found most of my info via reading websites etc and a few books although you really need to take everything with an open mind and not overanalyse it all or some of the stuff from books can only make you worry more.
The OB will do bloods etc to check different things at your first visit.
Websites can help highlight what foods should be avoided etc and what to expect at appointments
Otherwise just keep asking questions in places like this and someone will pop in and be able to help.
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