Hormone therapy

Hi ladies

I was recently diagnosed, 5 weeks ago, with Stage 1 Grade 1A (Have I got that the right way round?! Too much to take in!!) Endometrial Adenocarcinoma. 

Due to my age, 32, and the fact we don't have children yet, we are trying the hormonal therapy route first rather than opting for a hysterectomy.

I have been prescribed 400mg of Provera a day. 

My question is, is spotting and back pain normal whilst being on this? I don't want to be a drama queen and run to the doctors for little things when I don't need to but my hormones are all over the place and I'm over thinking and worrying about everything xx