Tamoxifen and menstrual cycle
I have been on tamoxifen since '05 and so far my periods have been okay, I went from 28 days to 29, then even 31 days. It would only last about 3 days. Definitely is not what it used to be. I am about a week late, so of course I got a pregnancy test, 2 in fact and both were negative. My breast are sore and I'm crampy, but nothing, what is happening?