Hi,
I was using Marvelon pill as birth control method but I stopped taking them on July to try getting pregnant with my second child. I noticed that last month I had brown discharge for a week before my real period started. Then again this month, I am having now brown discharge and my period hasn't came yet. Is that normal ? Or Do I have a hormone problem?

It is most likely your body's reaction to the sudden lack of hormone. It may take a few months to get back on track. I wouldn't worry.