Pain after ultrasound?

Shelley
 24 weeks along, two days ago I had a follow up ultrasound to look more closely at the placenta and organ functions of baby. Needless to say, a lengthy ultrasound, where they had to kind of dig around for a while. The day afterward, I could barely walk from the intense pain in my abdomen and uterus. Today, a little better but still sore and having a lot of pain (kind of like round ligament pain, only more intense). At one time I couldn't even tell what was happening with my body- I was having Braxton hicks all evening. 
Anyone else had this unfortunate experience after an ultrasound? This is my second child, never felt this way before!