Had hysterectomy 3 weeks ago. Started spotting yesterday. Should I be concerned?

Spotting common. Spotting and some type of blood tinged discharge is common for up to 6 weeks after a hysterectomy. It can come and go. Get checked if heavy bleeding like menstrual flow or if spotting persists more than 6 weeks.
Bleeding p surgery. Mild spotting or red-brown discharge 3 weeks after hysterectomy is not abnormal, as long as it is not in large quantity or bright red. Give it another 3 weeks to go away.