When to test?

So I had a chemical pregnancy in November and bled 6 days late, from Nov 23-27. My periods are normally exactly that long (5 days), so overall, it was pretty regular. This month we used opks and tried again. I'm currently 10dpo and tested this morning with BFN. I'm wondering when I should test to get a potential positive if I am pregnant, since I don't know when my period is due? Any help would be great 😥