Milk supply worries

Hi mummies. Im a ftm and i neeeedddd tips/advice. My bb is 18 days old today. Right when she’s born, she’s on both bm & fm as I have low supply. Doctors also encouraged me to give fm since she has jaundice. No she doesn’t latch and I only pump then feed her. Now I realised that each pump sessions, I’ll only get 60-100 ml at most. Been pumping every 3 hours. But if I dont pump for 6-7 hours, there’s more supply like 100-120 ml. How to increase my supply please :( Or will it stabilise only after 2 months? I’m so upset & guilty I need encouragement.