Sayang, if you're having any hardness or tightness in your tummy at 7 weeks, please call your doctor or go to the clinic to check, better safe than sorry during pregnancy, okay? One of my mum friends had similar worries early on and the doc said it was normal ligament stretching, but each pregnancy is different so you really need to get it checked out properly. Don't worry yourself too much in the meantime, most pregnancy aches and pains are normal, tapi kena confirm with your doctor lah. Take care!