My period finished 2 weeks ago now i'm having light bleeding that's a dark brown/pinky colour, but my period isn't due for another 2 weeks?

Mid-cycle spotting?: Since you are taking Clomid (clomiphene) for ovulation induction, and with a history of PCOS and irregular periods I would say that at this point you should experience ovulation. At approx. mid -cycle there may not be the hormonal support earlier or later in the cycle therefore the lining can break down just a little. When you see dark brown think of low and slow bleeding. Do not worry. We expect this.