Help!!

So I had a period may 6th - 11th. And my cycles have been lasting 31 days well I'm on day like 39, 40, 41 one of those days. And I have no sign of period or pregnancy. I took 2 pregnancy tests and they were negative. But after the pregnancy tests dried it was a positive. But I don't think it was evap just because it had color.. can anyone help explain. :( I'm confused.