Possible trigger******info on chemical or miscarriage pregnancies

If you had a chemical or miscarriage, how did you know that that’s what was happening? Did you get a positive hpt and then negatives? Did you bleed or have any pain? Was it when you’re expected af was due? Or maybe before or after it? I think I was pregnant (positive hpt on the 4th but now getting negatives) but now I’m thinking I’ve lost the baby. I had/have all sorts of symptoms plus a positive hpt. But now I’m getting negatives. I’m not sure if it was a fluke or faulty test. I went to the clinic the day after my positive, on the 5th and their urine test was negative. They drew my blood just to be sure. I got those results back on Monday. The blood test was also negative but I found it strange that they couldn’t tell me if my levels were actually at 0 and absolutely negative OR if my numbers were just super low and below their cover line of “being pregnant” when I asked, they seemed very confused and just said “it just says negative” and couldn’t tell me an exact number. They did tell me while I was there that it could either be just super early OR that I’m having a chemical/miscarriage.. but I haven’t been in any pain or bled at all. Nothing. I’m so confused and heartbroken. Please give me advice or stories if you have experiences. Good or bad.