I'd say it's growing pains - i had shocking sharp pains for the first few months of my pregnancy, ranging from period achy pain to sharp stabbing pain. I know it's scary - it doesn't make sense that it's stretching pains when your bub is soooo small, but your body is just getting ready.

Just try to relax (not easy I know in the first few months!), I was told not to worry unless the pain was accompanied by bleeding.

Good luck with the rest of your pg