How long for periods to return after miscarriage / ectopic pregnancy

Hey ladies. Would love to hear different experiences. I miscarried at 6.5 weeks, 3 weeks of bleeding later, I returned to be told it was ectopic.. I had blood tests etc & could manage at home & bled for another 2 weeks so 5 weeks in total. It is now 7 weeks on and my period hasn't returned. Prior to this my cycle was on average 32 days long, has been longer in the past but quite consistent for around a year or so. When should I be concerned?? Thanks!!