My last period was October 11th, which was a week late as to the 28 day cycle that I usually have. This month I have not yet had my period which means I am a week late, again. However, for the past two weeks I have had cramping off and on as if I am about to start my period.

Lately, I have been experiencing an increased sensitivity to smells. One example would be while at school, in the restroom, I smelt blood so strongly to the point that it was nauseating. Then a couple seconds later I hear rattling as if opening a pad or tampon. Usually, I don't smell these kind of things. Also, when in the cafeteria, the smell of the chicken sandwiches make me nausea to the point where I couldn't eat lunch. I've also experienced a bad smell that no one else can smell?

My breasts are tender as well, which they usually aren't before I start my period, but last month before my period, they were.

Also, I get nausea off and on throughout the day randomly for something as small as, for example, a girl sitting infront of me in class has long hair and her long hair kept laying on my book and it made me feel very, very sick.

I'm very confused. Is it just my hormones changing making my period later every week? or something else?