Ovulating & the Clearblue testing kit.

Hey ladies has anyone NOT had a solid smiley face on the clearblue ovulation test & ovulated? And hopefully fallen pregnant!? I have previously not had an issue ovulating & have used this test many times & have always got a solid smiley face at some point. This month I used it from day 12 until today - day 18.

Day 12 - low fertility

Day 13 - 17 high fertility

Day 18 - low fertility

I usually ovulate between day 14-16. My cycle has been a bit irregular since a chemical pregnancy two months ago.

Could the test be wrong & I did ovulate? Should I still continue testing? Any advice is appreciated.