Depo shot experience;advice ? Help ?

Marimar

This is my first month on depo & at first I was spotting I didnt really keep track until my period really came it’s not heavy but before my depo my period would last about 5-6 days and it would be little to none bleeding around the 5/6 day. On the depo I’m still experiencing cramps 5-6 days later in fact I think it’s my 7th day. When will my period end 😓 is it safe to take pain killers ?