Fetus not growing

Is your period irregular ie more than 32 days or more? If so, then it’s very hard to predict an accurate gestational age based on yr last menstrual period. Best to wait till heartbeat then u know how many weeks for sure. I experienced the same thing, cus I got irregular period and I visited the doctor too early. I know the waiting period in between feels like eternity but for now, you just have to wait week by week. I did private and gynae asked me to come bck once a week to monitor growth - and I only see baby’s heartbeat 3 weeks after my first appt. During these 3 weeks, doc gave me progesterone pill (Duphaston) and jab to avoid miscarriage / stabilise pregnancy. You may want to ask the benefit of progesterone if not prescribed to you yet