Menstruation post treatment

I finished chemo at the end of January, and I haven't gotten my menstruation cycle back.  My oncologist said that because I was young, he would expect it to return within a couple of years, but didn't mention any additional risk because of it (my tumor was ER/PR+).  I'm hoping to have kids when I go off Tamoxifen in five years, so I'm hoping I get my period back!

Since hormones can help some cancers grow, the doctors like to keep our hormone levels as low as possible. The return of a normal menstrual cycle indicates a higher level of hormones.  This will not in any way cause the cancer to return, but keeping the level low (or in the case of Tamoxifen keeping the receptors on the cells blocked) can help keep the cancer at bay if there happen to be stray cancer cells hanging around anywhere.