Maternity clothes... HELP

So I’m pregnant with my first. A week away from my second trimester, and I am to the point where my old pants are getting snug. I live in Eugene Oregon, and am wondering if you ladies have suggestions for inexpensive places to buy maternity pants. I don’t need super cheap, but I’m not trying to spend a bunch of money either. Also wondering if I should buy one, maybe two pair, and wait until I get a little bigger so I have a better idea of what I will need? Any suggestions are welcome! Thank you!