TTC after first miscarriage

Rachael
I found out I was pregnant in march. Found out I had a mmc in April. My baby stopped growing at 6 weeks. Ended up needing a DNC on may 13th. I bled for 3 days after but me and my boyfriend waited a week after to start ttc. I still haven't gotten a period and I've had my levels checked. When should I start testing again???