PP bleeding

Tori • Military wife . Momma to a 5 year old daughter. Currently pregnant with my little guy due 8/14.
I'm 3 weeks and some days after delivery. I bled fairly heavy the first 2 weeks, finally slowed and has been stopped for a week. I had a super easy delivery, no tears or anything. But now all of a sudden my bleeding is back, and medium? Is this my period?? My lower back is hurting like a period.