Period after ectopic!?

So i found out my baby was in my right tube when I went for my 12 week scan (I was actually 13 weeks) and was rushed straight to hospital for surgery to remove my baby and my tube this was on the 18 May 2017. I was just wondering if anyone knew how long after this I should possibly expect a period?? It's been over 4 weeks now and no sign of a period at all