Is this round Ligament pain?

I have a constant pain in my lower left abdomen for 3 days now, and once in a while I get a severe stabbing pain, so bad that it almost makes me drop to my knees. When I don't have the stabbing pains, I have a hard time walking and sleeping. If I lightly rub my left abdomen it is really sensitive to pain. I am 16 weeks pregnant (first timer) and been searching online and this is the only thing I could find, but it doesn't say how long this pain should last or if it is suppose to be a constant painfull pulling sensation. Should it hurt when I touch my abdomen? Is it normal to have ligament pain for 3 days? I am going to see the doctor tonight regardless, just to make sure that my ovary doesn't have a cyst that exploded. I'm hoping someone out there can explain to me that this is what ligament pain is all about. I need the peace of mind.