Hi,
I had only 4 rounds of chemo and had a period not long after I started and then nothing until just before my 4th round. My oncologist did another blood test after I had finished chemo and said that my ovaries were still working and that my periods may come back (I'm 43). Sure enough, in March (stopped chemo in Dec) they came back with a vengence! I had a really heavy period (changing tampons every hour) for a week and then two weeks later had another really heavy period. I thought it might be my body making up for lost time but I went to see a gynaecologist and he put me on some tablets to make them less severe. Since then I seem to have gone back to having them every 28 days or thereabouts. I am on Tamoxifen and that hasn't made any difference to my periods at all.
From what my oncologist told me, sometimes your periods come back and sometimes they don't. It depends whether your ovaries have been permanently shut down by the chemo (which mine don't appear to have been!). I think this would also depend on your age when you started the chemo but not sure about this.
I get a few hot flushes whilst I have my period (weird!) but don't seem to get them at other times of the month at the moment. I was getting them all the time when I finished chemo and until I started my period in March. but then they stopped.
Anyway, from what I can gather, it is the luck of the draw!!
Take care,
Louise