Miscarriage at 5 weeks no period 4 weeks later & negative test

Hi I'm after some advise really, I had a miscarriage early at 5 weeks 23.02.14, I tested 4 hcg levels at the time I started to bleed so had already lost the baby at this point. We have been TTC since I stopped bleeding 28.02.14. I was very very regular (every  28 days and bled for 6 days) before the miscarriage when should I expect my 1st af, I am not pregnant as I have tested for he last two weeks every Friday. Thanks