Worried Mom

Im currently at 4 weeks pregnant. When to poly yesterday to get referral letter and was told that the hosp(NUH) will call within 2 weeks. I had a miscarriage twice. Baby no heartbeat and cervical ectopic. Is it too late to wait? So far no bleeding. Only minor stomach cramps on/off. I also read from some forum that they will only ask to you come for appointment when you are at 12weeks pregnant. Isit true? #advicepls #pleasehelp