Very early mc?

So, I'm 33 ttc boyfriend and mines first together..I've conceived 4 times with 2 girls out of those and 2 mc. My question is how do you know if you had a very early miscarriage? I cramped something fierce for over a week before af which is not my norm..very heavy flow with larger clots than norm for me..can stress cause this to happen? Anyone have a similar question on thier minds of this has happened to them..guess it doesn't matter in not prego now but just curious..boyfriend thinks I had and early one..wish my periods were considtant seems like my cycles cycle back and forth from 28 then 26 days..ugh I'm just not gonna stress this month it's fun trying I'll just look at it that way this month