I was on the same birth control for two years and it worked wonderfully. One of the main reasons I got on it was to help with period symptoms (cramps, bloating, ect.) and when I  started to notice them coming back I went to my doctor to switch brands. Last month was the first month that i started my new brand and when it came time for me to get my period it never came. I've never had a late period and I'm worried. Is it normal for your period to be messed up when switching birth controls?