Labor can misalign your body a lot. I agree with Deepa to get medical help. You might need a Chiropractor and physiotherapy but doctor can advise best.
One sided leg pain could be a blood clot, please contact your provider ASAP!
Call the OB labor and delivery floor, OB emergency room, or on call OB ASAP and have them triage you. They will ask you a bunch of questions to make sure it’s nothing serious or emergent especially since it’s one side. Please don’t delay this. You’re postpartum but your body is still going through a lot while it heals and it’s safest if they assess you. Sending you positive vibes 🙏