breast milk drying up while pregnant 😭

anyone else ?? I'm almost 17 weeks pregnant and for the past week or two, my milk has started to decrease dramatically for my toddler who is 19 months. he used to feed 5 or 6 times per 24 hrs .. I'm lucky to get two or three feedings now and if he takes sips in between feedings, there is not enough for him. he nurses to sleep and was up almost 4 hrs past his bedtime last night in absolute frustration because nothing was coming out. 😢 makes me sad but if this is what nature intends then that's ok with me. might be time for him to start weaning anyway. anyone else experience this?