Confused please help

I have had 3 positive pregnancy tests and 5 positive ovulation tests and I feel pregnant... All the tests have ended up being pretty dark lines... What I am confused about is that I am only 14 days since my last period ended... This I'm sure was a period it lasted 5 days and was not out of the ordinary... This would mean I am not due to start af for another 10 days plus and the lines are very strong... Do you think I could of been pregnant  whilst having that period? I don't understand how the line is so strong already..? The difference is between being 1 wk or 6+ wks I'm so confused please help with any advice...? Xx