Belly pain-just need to whine

Lauren • Our little miracle Caroline arrived 1/28/15! Thanks glow!
Hi all, I'm 18+3 and today I have this nagging dull/burning/pulling pain to the left of my belly button and down about about an inch (right where I feel my baby's kicks). I'm sure it's just from my muscles stretching or uterus moving up, but it's just been constant since about noon and I wish I could lay down so bad (but I'm at work). 
​Anyone else feeling this?