I got faint line with sainsbury pregnancy test strip but then next morning it git darker but fainter than cont?

my monthly cycle is 30-40 days i can get periods at any time between these days my date was due on 22nd june ichecked on 27th evening with sainsbury pregnancy strip it a faint pinkish red line appeared in test line area and next morning it was darker but still fainter than control line but much darker than the previous test so guide me am i pregnant?