How big is she going to get?

I had an ultrasound today to check the size of my 2nd baby, i am 36 weeks. She weighed 3.3kg and her head is 34cm, her foot was 8 cm. My 1st weighed 3.690kg when she was born at full term., I am only 5 ft tall and weighed 48 kgs when i fell pregnant. How big is this baby going to get in the next 4 weeks? i am so scared.