Hello,
It is very common to have have backache post delivery.
Next Steps
For assurance, get
1. X-ray LS Spine AP & Lateral
Health Tips
Avoid using mattress while lying down, just spread a thin shit and lie on ground straight on your back.
Avoid bending down, bend in your knees and not at your back.
Follow some back exercises, that will surely relieve you.
Avoid lifting heavy objects.
For medications kindly consult online.