It's not too early. I went for my prenatal classes at the end of my 2nd trimester but wouldn't have mind going earlier. You would be able to put the recommended antenatal exercising moves to good use earlier!
my gynae told me beginning trimester 3 then go for hospital tour... maybe he wants to estimate whether i'm going for natural or c-sect first before i decide on the hospital.
I went for mine on the 10th week. Everybody else there had big bellies already. I went early because I wanted to determine if I should go with the gynae and for another hospital or not as she doesn't do delivery at my preferred hospital.