My doctor switched me to Ovcon 35 after I was spotting two weeks ...

My doctor switched me to Ovcon 35 after I was spotting two weeks before my period on Estrostep. This is my second month on Ovcon 35 and both of these months I have had brown dishcharge spotting with lots of dark clots starting with the second week of my pack like the Estrostep. I have had no weight gain yet (X fingers crossed that I wont ever) have had nausea however which may or may not be related. My breasts also get very sore about the same time that the spotting starts in the second week and this lasts through my period, which is not much of a period, it is exactly like the spotting except it turns to red blood. ??? My yearly is next month, but I dont know if I want to change to higher dosages of hormones because I've gained weight on them before.