Pregnant?

I'm 30yo with a history of ovarian cancer (5 yrs out!). I have my L ovary, and per Drs, fertility should not be an issue. HB and I planned to have a child during the next yr or so (don't have any yet), but could be that the time is now... Recently was off the pill for over a wk bc I couldn't pick up the Rx, and we had unprotected sex multiple times. Period has been irregular for the past few months; ranges from 21-28 days (used to be clockwork 28 days). Last one started around the end of May (28-30)/Jun 1st (I know, I know, when it counts, I cannot remember when it began!!). I've been on Provigil, which lowers BC efficacy, and also made the periods irregular. So...lately, I've had extreme breast tenderness, nausea (vomited a few times), and fatigue. I also frequently use the bathroom, but that's normal for me. I've never had to take a test before, and now taken 3, all of which have been negative (home kits). With my calculations, I think I might be too early (at 3 weeks, if I am on the normal 28 day cycle), but I'm getting lost here and really not sure how to figure this out. By the way, I did make an appt with my doc, but can't get in until July for "fertility issues." Any advice would be greatly appreciated!!