Clearblue advanced digital ovulation kits

Hi. I'm still breastfeeding so my periods are a little crazy. I decided to try the ClearBlue advanced digital ovulation kit. I started the testing the morning of cycle day 10... Got a O meaning low fertility.. Cycle day 11 same thing. This morning cycle day 12, I got the PEAK solid smiley face. It skipped the blinking smiley faces which mean high fertility and went straight to peak. Has this ever happened? We DTD sat (cycle day 9) and again today and will try for tomorrow as well. I'm just wondering if this even seems accurate. The solid smiley stays for 48 hours so you can't use the opk again for at least two more days.....

Thanks.