I have been having light spotting on my cycle day 28 for 3 to 4 days never had this before as normally i just have a period. i have been having headaches most mornings and a unsettled tummy i have pcos?

Irregular bleeding i: If this is a one-time problem it usually resolves on its own. If this is a recurring problem you should be evaluated. Infections &  hormonal changes can cause spotting. If there is a concern for pregnancy then do a home pregnancy test.  There are many options available to help regulate the menstrual cycle. Schedule a visit.