When to test

Okay so I had a miscarriage 4 weeks ago. I bled for 4 days. Tested and was negative. HCG levels dropped to 0. And had final scan to confirm only a week later.

Soon as I stopped bleeding we had sex.

We’ve done it mostly every other day without fail! My question is...

When can I test again to see if I’m pregnant. The reason I ask is because no AF yet no idea when it’s coming and no idea when I ovulated.