Tender breast / Swollen breast?!

Hi, people from yahoo, i am 20 yrs old and i have a few questions about my breast.

For 5months i was on the pill (birth control) and for my 6th month i switch to the 1 month shot.
I have been having sex with my partner, who i have been with for 4 years. Now lately for the past few weeks i have noticed a lot of symptoms but i can't come to a conclusion.

During December, a week before Christmas, i had my regular period, 5 days. I stop having sex and i stop using the pill. By January i had a second period, 1/2-3-4/2011 but it only lasted 3 days, so i got on the shot on January 12.

Now, today is February 15, and i still haven't got my period, for the past 2 weeks i have had Tender, swollen breast, a few days before the tender breast i was very tender from my inner vagina. Because of all of this symptoms i figured i was expecting my period, but till this day i still have not got no period, my breast are still swollen/tender.

Have any of yall females been thru this, and call yall give my some advice about what is going on with my body, before i head to the clinic?


Thank you =]