What’s a chemical pregnancy?

Hi all,

So I’ve had a miscarriage before and obviously you know because you bleed etc

But I’ve only just heard of a chemical pregnancy, and all I kind of know is that it happens in early pregnancy but still detected via a pregnancy test.

Sorry worried pregnant lady here 🙈, I’m just wondering if like a normal miscarriage if you would bleed or know that your experiencing a chemical pregnancy?

FYI I’ve had no bleeding at all just curious

TIA xx