Girls, hello! It's been 3.5 weeks since I had the baby. Lochia started…

Girls, hello! It's been 3.5 weeks since I had the baby. Lochia started to decrease today morning with some not-so-heavy red discharge. Nothing bothers me except that my lower abdomen sometimes feels tender on the right or left side for a few days. Is this normal? Experienced moms, tell me how your recovery went? And here I want to ask the doctor but I don't know who to go to, should I go back to the maternity ward? Since 40 days I'm supposedly under their observation, can I be seen by a doctor who delivered my baby? She was our private obstetrician. Or should I go to my gynecologist (+who handled my pregnancy)?