During my first interview (phone screen) I was asked how much I expect to get paid. I said $XX,000 (this salary is pretty low for someone in my field, and mentioning this low salary was a mistake. You can see the edit on this post as to why I mentioned the low salary: What steps do I have to take if I believe my pay should be higher after working at a company for 6 months?).
With that said, I moved on to a technical interview. Now I'm called in for an in-person 2 hour interview. There is now a possibility that I might get a job offer soon, and I'm not sure whether or not I should negotiate the pay (after receiving an offer).
I did some research and found this article: http://www.quintcareers.com/salary_negotiation_mistakes.html which mentions that the #-1 mistake is to settle / not negotiate.
The pay for this position is generally a lot more than how much I originally mentioned ($XX,000) but I don't want to come across as someone who said a low salary, did all the interviews and then asked for a significant increase (I'm pretty sure one of the main reasons I got this far into the interview process is because I didn't require a very high pay).
My question is, after I read the article which mentioned that settling / not negotiating salary is a mistake, given my situation, would you advise that I do or do not negotiate salary?
Edit: I believe this is not a duplicate of Does the first person to mention a number in a salary negotiation lose?. I already know I made a mistake and "lost". I mentioned a salary first (a low one too) during a simple phone screen. This isn't about if I lost or not, I'm just wondering if, given my current situation, it is advisable for me to negotiate salary after I get an offer even after mentioning a low pay during the phone screen.