Is Dark Brown Vaginal Discharge Normal After Starting BC Pills?

I am 18 years of age and i came on my period about a week ago and i came off about 2 days ago and i started taking my microgynon 30 pill and today i have started producing a really sticky brown substance, which has clots in it aswell. It looks like sticky but is the colour of dried blood. I am scared it is something serious which is why i am asking you... Please put my mind at ease. Sherrie