20-21CD, 5-6DPO Temp went down way and is below coverline, what's going on?

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Hello ladies, I have been charting since August of 2008. I am pretty much regular, cycles run from 27 to 33 days. For the Past chart month I have never ever have a DIP Temp way below cover line at 5 and 6DPO. I was wondering why my cycle is messed up. I used to be 31 to 33 cycle. It seems like lately my cycle is getting shorter. Jan 09 cycle was 29 days. Feb 09 cycle was 27 days. And yesterday I was on CD 20/5DPO temp drop to 98.1 and did spot just a speck of pink on tp. Today is CD21/6DPO and temp waking up temp still at 98.1, what's give? I do not feel anything. Boob's is tender but this is pre-af symptoms. I am dry and dont think I am pregnant but I want to be pregnant so bad. What do u think is happening to my temp? Thanks ladies, BBT chart is attached below, pls take a peek and what u think. http://www.fertilityfriend.com/home/2222cc