You have a 35 days cycle. So the ovualtion should be arround 21st day of cycle. as per yoyr history, this time you had spotting,which lasted for one more week.So ovulation could not take place & so no chance of pregnancy
in the month.
The sore breast &brown discharge off & on suggest Either missed abortion( previous month pregnancy) OR hormonal
To pinpoint the condition you should be physically examined by a Gynaecologist & investigated (USG abdomen)
The treatment can be decided after that only.Please don't worry,it can be easily managed by proper approach.