Thanks to anyone who reads this. I feel like I'm probably overreacting but if you could give me some reassurance or tell me your experience I would appreciate it.
I have been on Aviane, a lower-dose BCP, for about 7 months now (before that I was on ortho-tri-cyclen for about 9 years). I just completed my 3rd 10-week cycle - 3x3 weeks of active pills, 1 week for your "period." In my first two cycles I had a lot of breakthrough bleeding but in the third cycle I didn't have any so I figured my body had finally adjusted to the new lower dose. When I was on my last pill my period almost always came on Thursday or Friday (I start on Mondays) but it's been more irregular on this pill because of all the breakthrough bleeding. So I was expecting to start bleeding by the end of this past week.
On Friday morning I noticed a tiny bit of brown discharge so I figured my period was starting. I did bleed a slight bit that morning and early afternoon - more like spotting than a real period - and then it was completely gone. I thought maybe it would start again on Saturday but it didn't. This is the first time in the 10 years I have been on BC that I haven't had a period lasting at least 3 days.
I did miss one active pill that I remember this cycle - I believe it was last weekend. I took it about 24 hours late, along with my next pill. My husband and I did not use a back-up contraceptive method following that.
I have not had any other early pregnancy symptoms or detected anything unusual about my body other than feeling light-headed about once every other day in the past couple weeks, which I thought was maybe from not eating enough carbs in the previous few hours.
My question is: Should I take a home pregnancy test tomorrow before I start my next pill pack? (I have never taken one before so I'm nervous.) Or might a period lasting only a few hours perhaps a new normal for my body after adjusting to my new pill, even though I've been on it for half a year?
Sorry for the mini freak-out. This is just very unusual for my body. And of course we're really not wanting to be pregnant right now!

