Milk production stopping...?

Hi... I'm new to this whole pumping and breast feeding thing... i wasn't able to breast feednmy daughter bc I couldn't produce anything... but now I'm on to my second kid and I'm so grateful I can breast feed.. especially with the formula shortage going on... he was born 10 weeks early and my milk was coming in good.. but now they are letting me start to breast feed him and I'm not getting as much when I pump... is this normal or should I be worried about my milk stopping...