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.
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