Constipated newborn

My LO is 3 weeks old and has been having bowel movement issues. Ive completely run out of ideas. Hes exclusively formula fed and has passed one hard stool this week. We’ve tried switching formulas, belly massages, bicycle legs, rectal thermometer, the q-tip trick, karo syrup, and even tried a little prune juice his formula. The prune juice helped clean him out but he hasn’t pooped since and it’s been almost 2 days. I’ll call his doctor in the morning if he doesn’t poop by tonight but wanted to see what everyone else thought.

Also everything I’ve read and all my family keeps telling me that formula fed babies need to poop at least 1-2 times a day, going 2 days without pooping is worrisome