What time of day do you use OPK’s?

Hi :)

I had found out I had a blighted ovum when I was 8 weeks pregnant in October. I took cytotec at home at the end of October. I had retained products and had to go for a D&C the end of November. I was advised to wait for one cycle to return before TTC. I am now ready to go, but have not had a LH surge (or even close) and I’m on day 15. I normally have my surge on day 14.

What time of day do you guys test? And how soon did you start ovulating again after miscarriage?

Thanks :)