I am currently 14 weeks pregnant. For the past three days, I have been…

I am currently 14 weeks pregnant. For the past three days, I have been bleeding brownish and light red blood without pain. I went to the hospital where they sent me for an ultrasound. They found a fetal pole measuring 4.4 cm, meaning I am 9 weeks and 3 days according to the doctor's calculations. The cervix is closed, so I have to return in seven days to check if the fetus is growing. What will happen if the fetus does not grow? Anyone who has gone through this, please explain further. I am confused.