Always Crampy.

Na
It's been this way since week 9. I'm 15 weeks now.
I ALWAYS have some sort of cramp, sharp twinge, or pressure-like pain. 
I know that some of it comes from gas/constipaton- but I'm not always gassy or constipated.
I've seen the baby three times during these weeks, perfectly healthy. It got worse after a mishap I had where the doctor pushed way too hard at an US, but I went back after that and the baby is fine. Is it really just me being sensitive to the uterus and round ligament pain?