Hi I had sex on October 14, 2016. I later got my period on October 17-23. And November 19-25 I had my period and didn't have sex in November. Now in December of 2016 I didn't have a period for one month. And I'm in January now since January 1-9 I haven't had a period since then. I don't take no birth control pill or anything. I took a pregnancy test it came out negative I do have mood swings. And also had a clear dishcharge with a little brown in it and didn't start my period. Can this be an iregular period? I am always normal on my periods.