Miscarriage?

Hi - I am at 4w5d today - and earlier today I had some light spotting which I’ve read is normal so I didn’t think much of it. As the day progressed, the blood flow increased and I did see some dark strings within that came out when I went to the washroom. I also started getting a really bad cramp but it only lasted a few hours (it’s already gone), and I feel like the blood flow also decreased as I went to the washroom just now.

I’m really worried I just had a miscarriage but can it happen over just a few hours? Or am I just scaring myself? I don’t know if I should go to ER or not, but I feel like there is nothing they can do this earlier in the pregnancy. Has anyone experienced the same thing and what was the outcome?

One thing I’m thinking of doing is doing preg test over the next few days to see if line darkens or lightens. Any other suggestions for me to find out?

Thank you