I Think I Had A Miscarriage Im Really Scared My

I think I had a miscarriage im really scared my first period after the last time i had sex was late for 8 days and was really heavy in the night as well and I usually dont get my periods in the nightime it lasted for 4 day I think then the next period was 6 days late was aldo heavy then my 3rd one was kind of normal I find it kind of strang I need help im really scared