AF is five days late...is it possible?

OK, this is annoying. I went off birth control at the beginning of last month because my husband and I wanted to TTC. We had sex around the time I thought I was ovulating (normal ovulation cramps all that for me). About 7 dpo I had a bit of light spotting when I wiped (sorry if TMI) that only lasted a day. I've had some pregnancy symptoms (weird cramping, the spotting, bloating, fuller breasts, slippery cm) and am now five days late for AF (due Nov 6th) with no signs that it's coming (I usually have awful, awful cramps and very little cm before it comes). I have taken two hpt (one on the 6th and the other on the 7th) and they have both been negative. I know going off bc can screw with your cycle but I've never had a problem with it the other times I've gone off it.

I think I'm going to wait until this weekend to take another test, but do you think it's possible that I could be pregnant and just not have high enough hormones in my system to cause the test to be positive?