Clearblue Ovulation test madness

I was wondering if anyone had ever experienced their ovulation tests coming back as 'High' for several days (I use Clearblue Digital) but never hitting 'peak'?
I've been using the tests regularly as my period hasn't gotten back to normal after having a Merina IUD removed.  This month I've clocked high results for 5 days running but no 'peak'.  Is it just me?