I Am 36 Years Old I Am Partially Breastfeeding, I

I am 36 years old I am partially breastfeeding, I have been on Birth control for the past five months. Three months ago I started the pill that you only get your period once every three months. about eight days ago I started spotting light to moderately, head aches and cramping is occurring. it has not stopped. I am not due for the yellow pills until next tuesday