Hi all! I am finally at the 14 week mark, and so excited about it!

I literally had my doctor appointment yesterday and all was fine - heart beating at about 155 bpm!
So of course, when I got home, I developed what seems to be a new symptom that hasn't yet gone away today. My lower abdomen is achey. Almost like menstrual cramp achey, though more localized. It's hard to say if it's smack in the center or a little to one side, but there is a definite ache on and off since yesterday. This pain isn't enough to slow me down or anything, but its got me concerned. I researched round ligament pain, but it seems like that is more of a shooting pain when moving? This ache is felt most when I'm just sitting around.
No spotting or anything else abnormal.
Could this just be my uterus expanding or something else totally normal? Or should I call in to my doctor? Any advice is appreciated!
Re: Lower abdomen aches?