Irregular period with spotting

Eleni
Hi guys,
​So this is going to be a long explanation/question. 
​8 months ago I came off the pill. For the first couple months I had regarlar periods a little off the 28 day mark but otherwise normal. In June and July before I got my period I would have 4-5 days of brown spotting and then have 7 day period. 
​In August again I had a normal period. It came right on time and was 6 days long. 
​September came around and I had brown spotting for 9 days then 1 day of nothing and then 4 days of what seemed to be a normal period flow. 
​I've had an ultrasound done and could find anything. Soon I will have a hormone blood test but am worried it may be something else. Could this be that my body is still trying to get back to normal after 7 years on the pill?