Anyone else?

Is there anyone else who hasn't received a BFP until after the day AF was supposed to show up? I took a test two days ago (2 days before AF expected), and got a negative result. AF expected today, and so far nothing. I know I could be setting myself up for disappointment (yet again), but I'm hoping this may be a good sign. Just wondering if there's anyone else out there whose levels took a while to build up before getting a BFP??? Any positive  input welcome! Suffered a mc at 17 weeks in Jan. 2015, and a chemical in Oct. 2015. I'm embracing the fact that my rainbow baby will come when the time is just right, not when I "want it to." It's hard understanding why things happen the way they do sometimes. Cautiously optimistic