Ai, at 11 weeks pregnancy memang ada rasa mencucuk-mencucuk kat pinggang sebab ligaments tengah stretch untuk accommodate baby yang growing, but kalau rase very sharp atau persistent, better check with your doctor just to be safe la, a few of us had similar aches and turned out normal je, tapi tak payah risau sangat, let the doctor confirm. Could also be round ligament pain, which is super common at this stage!