Stretching My Ears - Advice

I've stretched my ears twice in the past, the first time getting up to a 2g and this past time getting up to a 00g. Every time I had a question I would ask this friend of mine, but I have a few questions that I either haven't been able to get a good answer to or there were a lot of answers to them and it overwhelmed me. I don't like to Google questions like this because I understand how personalized it is, each person's ears are different. I was, however, wondering if I could get some advice. I'm thinking about trying to get up, or maybe past, a 00g again, but I wanted to look into some thing beforehand.

First, is it safe for me to stretch my ears while pregnant? I've seen a lot of different answers to this so I want to hear from a better variety as the woman I usually talk to only just got pregnant with her first.

Second, how do I clean them? Like, how frequently, do I take the tunnels out, what do I use, how do I clean them, etc.

Third, does anybody know what the opinion currently is on teachers who have stretched ears? I had an art teacher in High School who had huge tunnels but I've also had people tell me that nowhere would hire me if I stretched my ears.

Fourth, what kind of materials are best for your ears?

Thank you all in advance, and I'm sorry for the long post. I just want to make sure I do it right this time without jeopardizing my goals.