Is It Normal To Continue Bleeding After Taking Norethisterone For 5 Days To Treat An Ovarian Cyst?

Hi,my period last more than a months the doctor said i have an ovarion cyst he gave me folic acid tablets ip 5mg vitafol for 1 months and norethisterone table ip primolut - n for 5 days after complete the norethisterone table i started bleeding again is it normal??pls