twinges in middle lower abdomen

I'm on CD 21 and 7 DPO but totally new at charting.

I have experienced RLP during pregnancy but this seems different b/c it's in the middle of my lower abdomen. They feel like tiny pains that only last a second and come & go.

I don't know if/how to share my FF chart but I will try. Please, charters take a look and tell me what you think about the temps being so low... is that normal. It says I ovulated but two temps after O are at my baseline and this am it was below??? I realize my chart probably doesn't answer the actual question I'm asking but I thought it would be great to get the opinion of some experienced charters as well.
  
http://***********************/ttc/chartgraph_module.php?d=2010-10-29

[LilSissy03]

*********************** in above link is (without spaces) fertility friend . com

[LilSissy03]

Actually, they are more like pinches... and ONLY in my middle lower abdomen (uterus location) not on the sides.