Can chemicals still give you dark positive lines?

I’m so paranoid after my chemical in June. The line never got dark and surely never got a YES on a digital. Never even got pg symptoms. Found out about a week ago I’m pregnant again! However the line is super dark, on each different brands I’ve taken all dark and I even got a YES on a digital! I even have symptoms! I’m so excited but I don’t want to get too excited in case it doesn’t stick:( anyone else experience this? Is it possible it could still even in a chemical?