Heavines in lower abdomen in first trimester

[KatherineCam]

Is it normal to have occasionally feeling of heavines in lower abdomen in first trimester or should I worry? I sometime think it might be tramped gas (although I am not gassy) or something else related to lower bowel rather pregnancy but may be I am not right.

I personally had what you describe in first trimester. I read in my pregnancy book that it was the feeling of the placenta being "built"!