Need opinions

I'm 12 weeks yesterday. And for a couple days had some cramping and again today. Yesterday I was ok. . Has anyone had to deal with cramping? In my first pregnancy I didn't... It's not agozning pain but it is really u comfortable .. Standing at work is making me exhausted because of it ... I know some cramping is normal because uterus expanding but how do you know if it's something else bad or indigestion? I'm literally leaving work early because I can't even stand here all day it's so uncomfortable .. Anyone have this ? It's like half feeling of getting bigger half feeling of like menstral cramps. I'm not constipated ..