Thanks for the replies girls. I appreciate you looking at my my chart.
Yes - I got up an hour later on 1, 2, 3 and 4. I know this isn't ideal, but refuse to set a crazy early alarm on none work days. I always do this on weekends (this one just happened to be a long weekend). I seem to have moveable temps as they are always up and down, even on days where I get up at my "normal" time.
I know dtd on ov day isn't ideal. This wasn't on purpose, just the days I managed to convince DH to dtd! 
Think my thermometer is fine. As above, my temps vary a bit even when alarm is set at "normal" time.
I think Im not convinced about Ff ov date as its so much before CB OpK peak. But I guess this could happen.
Also I had really strong stomach ramps yesterday - so thought this got be ov.
Guess Ill just have to wait out another few days .......