Bear with me , long post!

This month is my first time using Clearblue digital. I input all my cycle information and started testing the day told me to start which was the day after my 3 day period ended my last two cycles have been 18 days between a f. MC was on September 4th HCG went to zero by the end of September. Prior I was always 25-day cycle on the dot. However like I said the past two cycles have been 18 days between. I had run out of wondfo so exclusively started using Clearblue digital on the 6th which I believe was a Sunday Monday Tuesday Wednesday Thursday and Friday morning I had flashing Friday evening solid smiley which I've read is peak. However I had also ordered a pack of cheapies which came yesterday and I decided to take one which looked close to being positive yesterday and now this morning around 10:30 my test looks like this what is going on? Second LH surge, or extremely long Surge from Friday to today? And when in the heck do I BD?