Help baby not pooping

He poops every 6 days like clockwork and its been going on for a month. i have an appointment with doctor but its not until Monday. He hasn't pooped for 10 DAYS now. He is 10 weeks. Breastfed. Anything i could give him or do to make him poop? Doctors in my area suck thats why i have an appointment so late. Ftm here.