Positive test then this??

Hi girls.

I am officially 4 days late for my period. I’ve done 4 tests all which say positive. Some lighter some darker lines and one digital which said positive.

I’ve had lower mild pain two days ago. However yesterday I got bad cramps and tightness in my lower back and stomach.

I started bleeding and still bleeding today.

I was bleeding quite a bit yesterday but today it’s calmed down. (Picture below from today)

Today I’m bleeding less but ive passed a tiny

Clot earlier in the morning.

I’m just wondering if this could be implantation bleeding or a chemical pregnancy/miscarriage.

I am absolutely scared and worried at the same time.

Thank you for any answers girls!