ADVICE NEEDED

So as of yesterday my period was 2 weeks late, I have done a pee test but it came up as invalid and the second one came up negative. I feel I can still be pregnant as I have always had low HCG levels (my last pregnancy which resulted in a miscarriage didn’t show up in any pee tests and I was 3 months)

But today I started bleeding and I’m so devestated 😭😭

Is there a possibility i could still be pregnant? It’s not heavy bleeding, it’s bright red and a medium flow.

I’m going to the doctor on Thursday to get a blood test but I want to know if anyone has experienced anything similar before.

Thanks in advance xx