Hai sayang, cramping tu memang common dalam early pregnancy, tapi because you're at 9 weeks and the tightness/hardening is coming and going, better safe to check with your doctor just to make sure everything's progressing well, especially since this is your first baby, you'll feel better knowing! A few of my mum friends experienced the same thing and it turned out fine, tapi setiap pregnancy lain-lain, so don't tahan-tahan ja, text or call your clinic and let them ease your mind okay.