What Are The Side Effects Of Marvelon Tablets?

my age is 33 I had sex on the 11 day after my period, we had used condoms but it broke after 19hrs i took 3 marvelon tablets together for the first time then 1 tablet each for the next 4 days, i didnt do any sex after that now. my actual period is on 11th of may of this month but from two days before i am getting brown discharge.dont know what it is