Worried about my newborn

Bella

My baby is 2 weeks old and for that past day he’s just been nursing on one side at a time for about 20 minutes and then goes to sleep. Am I going to dry up because he’s not nursing on both sides every time and I’m worried he’s not getting enough milk. He’s peeing just fine and poops about once a day. I’m worried about drying up and him not gaining weight or getting enough to eat