Enlargement of the breast tissue during development, causes soreness and tenderness of breasts in teenage girls.
Also, from the time a girl begins to develop breasts and begins menstruating and throughout life, women may experience what is known as cyclic mastalgia or breast pain related to menstrual period or hormonal variations during the same.
This pain typically is worse before your menstrual cycle and usually is relieved at the time your period begins.
Vaginal discharge immediately prior the ovulation is increased and wet and slippery, similar to the consistency of raw egg white.
The greatest amount of this type of vaginal discharge is produced on the day of ovulation, and the next day gradually becomes thicker in consistency, and less is secreted.
According to your date for expected menstruation, your ovulation day was probably on 27 june.
Don't forget that fingering is not risk free for STD's transmission.

Best wishes!
Marija

Thanks for the info.
After about 10 days, my breasts didn't hrt anymore, they're fine now. But now, i've been getting cramps like im on my period (but i haven't gotten it yet) and i've been feeling dizzy. Also, yesterday i felt sick. I also have lost my appetite and i'm losing a lot of weight. My friends say it could be depression as well.

Do you have any thoughts on why this might be happening? I've been crying because i'm really worried.

also, my period has been going through weird cycles lately, as in it's not regular.

You could be depreseed, if you think you might be you should either talk to your parents (as hard as it might be) or schedual a doctors appointmet. Stress can cause your period to be irregular, along with weight loss.