Guys i am 4+4 and I am TERRIFIED! Of another miscarriage. I keep convincing myself it’s happening because I don’t have any sickness?

Well I had bouts of sickness 2 days ago and I’ve had nothing since.. boobs are still sore and still a dark positive pregnancy test. I’m just so so scared, and now I’m wondering..

When having // had a miscarriage how long would it take the lines to go faint? Would it happen pretty much straight away or would the lines stay dark for a while and then gradually go light over time? Please someone give me answers really freaking out!