Chemical pregnancy

So I've had 4 faint positive tests this past weekend. I even tested this morning and received another positive (pic included). I've never had color on any test so I was ecstatic this weekend when I saw that faint line! However, I started bleeding yesterday and have been bleeding pretty heavily today too with some bad cramps. I'm pretty sure I'm having a chemical pregnancy and I have a doctor's appt this week to see what's going on BUT I'm just wondering if anyone has ever had a chemical pregnancy and what that was like? Or if anyone has ever bled heavily while still getting positive tests and remained pregnant? My hopes aren't up but I do find it interesting that I'm still testing positive on tests each morning.