Period-like cramp

Hi! I'm 11w and 1 day. I'm in the Uk and my first scan isn't Until 12 weeks which is next thursday. I've had a fairly good pregnancy so far, nausea was horrible for a few weeks but no actual vomitting, and I've just been mega tired!
Now I don't know if I'm just panicking for no reason, but today for all of about 5 seconds - I experienced a horrible cramp (almost like a period cramp) but then totally disappeared. It wasn't trapped wind (cringe) because I've been getting that a lot and that is a different pain!
Will everything be ok? Is that normal?
I cannot wait to next Thursday!
Paranoid mama to be.
Xx