I think i might of had a miscarrige before i knew i was pregnet?

See below: It could be your cycle. Menstrual cycles can be irregular. If pregnancy is a possibility, be sure to rule it out.

Possible: Some women have miscarriages even before they miss a period! we can't know how many because they don't usually come in for a check since their period does come about on time! for you, check with your obgyn to make sure you are ok and to check your hormone levels.