Is It Normal For Not Getting Periods After A Prostap Injection?

Hi
I was wondering if you could help me? I had my last prostap injection at the end of October and have still not had a period. I was wondering if this was normal? I have been feeling sick and had a lot of discharge over last week as well as having really sore nipples. Is this normal? I haven't done a pregnancy test yet because I don't know if iv missed a period or just still waiting after my injection
Thank you Hellen