1st clomid cycle

Helaina • Married in October 2015 and ttc since the month before the wedding (no patience lol). Off depo for 2 years.
So I started it cd 3 as advised by doctor and my period came to a sudden halt. I was actually having a very heavy period and I'm always a full 5 days. Has this happened to anyone else? I can't get through to clinic to ask.