Brief background: 1DD (3.2). TTC #2 since July 2013, and have had two miscarriages since then, both last year. So, I know my cycle well.
Usually I have 30-31 day cycles, ovulating on CD18 (I temp and use OPKs). This month I ovulated later than usual, CD21, so I'm currently 13dpo. However, on CD31 & 32 I was spotting and felt crampy, so assumed AF was on its way. But it's all stopped today, and my temp is rising again. I feel tired, nauseous, and my nipples are stingy. Essentially I feel pregnant but I've done two tests and both are BFN.
I'm not usually a spotter, so this whole thing is really unusual for me. Have I just been thrown by the late ovulation? Surely if I was pregnant I would have got a BFP by now?