HELP ME PLEASE! NEED ADVICE.

Me and my partner want to try for our 2nd child now our daughter is 5. I stopped taking my pill around 4 weeks ago. I started taking Clearblue Advanced Digital ovulation tests on 15th December, I kept getting a low reading until 20th December when I started getting the high flashing smiley, it's been 4 days now and I'm still getting the flashing smiley and not yet had the peak smiley. Is this normal to have to wait longer to move to peak or should I stop trying this cycle?

My first daughter was a surprise so I'm new to the whole planning thing lol. Thank you in advance. :)