BBT help

So this is the first time I’ve started recording my BBT and using OPK’s. I’ve been using the clearblue advanced OPK. So according to the OPKs I had no high fertility days it just all of a sudden recorded my first peak day on CD11. But yet my BBT chart doesn’t look like I’ve ovulated as my temp as pretty stayed the same. Does this mean I probably haven’t ovulated?