Do you think I could be pregnant?

I do NOT have a regular cycle. When I say that I mean I haven't had a cycle since 10 Jan 2008 and today is 10 Jul 08. I haven't been on any form of bc since Jan 08. 22 June 2008, I noticed a different discharge than usual after a two day marathon with my boyfriend. At first I just chalked it up to too much . It was clearish white, orderless and there was a ton of it. On the 23rd I went to the doctor and got checked for STDs ( I thought maybe my guy had stepped out on me). The doc said that it looked like normal discharge there was just a lot of it. Wet prep said wbc, but nothing else, DNA probe said I'm in the clear too. So I started researching on my own what it could have been, and i think it may have been ovulation mucous. But since I don't have regular cycles and I've never noticed anything like this before I don't know for sure. On 7 Jul I woke up nauseas and have been that way daily 'til now. No tenderness. Lots of fatigue and dizziness. HPT is negative...