I believe your body is just adjusting. And who knows. . . You've been on the pill for 10 years, maybe now your cycles are just longer.
I remember thinking I was pregnant my first cycle off the pill (I wish!). I was basing myself being late on the fact that I MUST have a 28-30 day cycle. Well, it turns out my cycle is 36 days long. No biggie. . . I've had tests done to confirm I ovulate and that the egg quality is good. It's just long. Good luck to you!
As you know, I haven't gotten a BFP yet, but I was on Depo for about 5 years, and then the pill for about 4 years (ortho lo). I went off everything in January 08. My first month was a normal 28 day cycle. The next month was 31, and then back to 28 again. I then had a 32 day cyle. After that though, I've had a 15 day cycle (Weird!), a 36 day cycle, 2 33 day cyles, and then a 32 day cycle. So, based on the past several months for me, I'm assuming it can take a while for your cycle to regulate itself (at least I hope its from BC that my cycle is so loopy!)
I don't have any experience with the pill, but I was on depo for a little bit and it took months for my cycle to get back to normal! But I don't think the pill is that potent! It ***** seeing BFN and not knowing whats going on with your body! I would wait another week or so to see if AF shows up! If it doesn't, take another test. And if that one is a BFN too, that means its time to see a doc for a blood test! Hopefully you get a BFP before it comes to that! : ) Let me know what happens***