Spasms

So I'm only 7-9 weeks pregnant (I haven't been to an official appt, the nurse just guesstimated over the phone)...I Know I'm not feeling the baby, because it's the size of an olive or so apparently, but I can feel spasms in my uterus. I've got these even when I wasn't pregnant, but it's at a constant this morning. I'm guessing it's my body getting ready to stretch in the next few weeks/months. It's not like a cramp, it's like when you get a twitch in your leg or something..painless. Anyone else feel that?