Brown Discharge and Cramping on Cerazette - Worried!

Hi everyone, 

I'm 22 years old and I have been taking Cerazette (mini pill) now for about 2 years. I was prescribed Cerazette by my doctor due to my severe weight issue, I am currenly over a BMI of 50 and therefore any other pill would put me at risk. 

For the past 2 years Cerazette has been perfect for me, I had stopped having periods altogether and I didn't have many other side effects. About 2 weeks ago I woke up to find that I had very light brown discharge/spotting, only enough to be seen as a wiped and no sanitary towel was necessary. I carried on to have this discharge very lightly but it did tend to stop and start. About 2 days later I woke up and to my suprise I had a very light red bleed, again not enough for a sanitary towel and it was gone and back to brown within a few hours. Since then the discharge/spotting has stayed the same and has been a mixture of red and brown, however predominantly brown. 

About a week after the first sign of spotting I began to develop very minor cramping and a sense of pressure in my lower abdomen. I also experienced a very sharp pain in what I believe to be my right ovary (but I cant be for certain) whilst on the toilet. 

Today I still have the cramping and pressure, however the spotting has become very light and barely noticeable and is still very much on and off. I do intend to go to the gp about this however I suffer from really bad health anxiety and therefore I was hoping someone might have some idea of what is going on.

Thanks :)