This is my first cycle of BBT charting and I'm a bit confused. I am on CD10 and have taken my BBT since CD7 so that's 4 days. CD7, 8 and 9 my BBT was exactly the same, but this morning it was 0.2 degrees (celcius) lower. Is this normal? I thought my temp was going to get higher not lower?! HELP!

I'm not a BBT expert but that seems like a perfectly normal within the limits variation to me and like it is absolutely no cause for concern.