How can I tell if I have had a miscarriage/chemical pregnancy?

This time felt different I felt pregnant, I can’t explain it I just felt pregnant. And my period has been coming 3 days early for the last 5 months but this month it came the day before it should normally come, I had pains in lower back and lower belly and so much worse than normal and a few days before I was due. I was a little heavier than normal and in a lot more pain than normal, even after a few days of being on.

I’m normally in pain 1-2 days max this time it’s been 2-3 days before and the whole time I was on and a day after but it’s not constant it’s coming and going?

Any advice please?

And before someone says go to doctors I don’t have time to m, this is why I’m asking on here

TIA