Discomforts?

I'm not sure if this is just the growing baby/uterus, and I feel ridiculous complaining of being achey and uncomfortable at only 20 weeks, but my lower abdomen seems to have some mild discomfort (I don't even think I can describe it as pain... Very mind pain if that). It almost feels like a muscle ache or something... But I notice it when I stand up, bend down to get something, when I get dressed or roll over in bed. Am I just becoming more aware of the baby or is this abnormal? I have my anatomy scan on Tuesday of next week. I've been feeling little movements here and there, not much though. Some days more than others.  Any insight is much appreciated :) thanks! I will be 20 weeks tomorrow.