just had this experience this morning. last night checked Red D around 40%-50%, used clearblue, no "laugh face", checked red d this morning, only 10% or less, used clearblue, show "laugh face"...
Birth 15/3: W:4.2kg L:52cm HC:37.5cm
Day 09: W:4.37kg L:55.5cm HC:37cm
Day 46: W:7kg L:62m HC40.5cm
Day 82: W:~9.2kg L:~66cm
Day 112: W:~10.4kg
This thing didn't happen on me. I only used this method for 2 months. Both last month and this month, both Red D and Clear Blue showed 'positive'. But I still have not got pregnant yet. My doctor asked me not to check anymore because she checked that I hav regular ovulation each month, so she asked me to be relaxed and not to check anything that makes me feel pressured.