Unlike in other mammals, rabies typically takes months to develop in humans. Waiting 10 days will not make any difference other than a lot less pain and expense, given the high odds that the cat who bit you is not rabid.
Although the possibility of rabies is low, there is a risk of tetanus, and a risk of infection. Infected cat bites are severe, as their teeth can go very deep.
Make certain you don't neglect these possibilities.
How soon would rabies symptoms show in a 8 week old kitten?
The incubation period can vary from 2 to 12 weeks and in rare cases even longer. However, rabies in cats is relatively rare, especially with very young kittens. Are you seeing any symptoms or to you have reason to suspect that this kitten has been directly exposed (i.e. bitten by or has eaten a rabid animal?).
No. It doesn't seem like he has any wounds or ever did. They've lived in my backyard since they were newborns. The mother didn't seem odd either. We've been feeding them since the mother was around but since they are old enough she's been gone. They've slowly been learning to trust us but they still become afraid when noises happen etc. so they don't act completely trusting. They all act like normal kittens (playing, eating, drinking, sleeping, grooming etc).
Problem is is that I have panic/anxiety disorder and I guess probably some hypochondria so I keep thinking what if if just hasn't shown signs yet? But I keep telling myself is basically impossible for it to be infected because I've never ever seen any of them limping or wounded or even any wound marks on it or any of them.
At most I'm assuming they might have fleas/worms/etc. I've already received a tetanus shot yesterday and will be starting antibiotics today (even tho I don't really need them cause the bit hasn't become swollen or anything crazy at all).
Oh and for the rabid animal part I don't know. I've read that rabbits don't really have rabies but it's possible? I do remember seeing a rabbit carcass that the mother brought to eat maybe about a month ago.