It could definitely be your ligaments stretching..... as long as there is no cramping or any more bleeding I am sure you are fine.... BUT it never hurts to call your doc just to ease your mind! Thats what they are there for!
Liscamdave! Shame on your dr office LOL that is what they are there for..... I know how hard it is not to worry (especially if you have experienced a misscariage) and they should be answering any concerns you have!
you are only 13 weeks and can feel the baby moving?? Wow, I couldn't with my daughter. But as you said, you know what to look for and what to expect.
I had some lower abdominal pains as well, and my dr said its my uterus stretching. Believe me, I called every time I felt something out of the ordinary, so I am sure things are fine. Have you called your dr?? They told me to stop calling,lol....I am a worry wort...