Ladies who have had a miscarriage...

What were the very first signs/symptoms you had? I know of course there's a lot of cramping and a lot of blood and clotting.  But does it just come on like that all of a sudden, or does it start gradually? And has anyone started gradually bleeding without cramps at first? My body is doing something weird and I'm trying to figure some things out. I'm not even 100% sure if I'm pregnant or not yet but something is going on. I know everyone is different but can some of you tell me your experience with this please!! Thank you!!