Not from the activities you have described.
Regarding the liquid from the breast, milk or colostrum only develops to support the baby right around the time it is born. So unless you've been pregnant for 9 months, pregnancy is not what is causing the white liquid. (I guess you would have mentioned it if you had been pregnant nine months.) You should go to the doctor to check your prolactin levels, to see what has caused the fluid.
Fingering yourself using saliva for lubrication after giving a b. j. hours earlier is not going to get you pregnant. Your mouth is not a storage medium for semen, it would have been way to acidic to support semen survival. And besides, you used mouthwash, and you presumably ate a meal in the meantime.
Are you really saying you gave your boyfriend head at school? Do you really think that's a good idea? First of all, you could get caught, and schools don't smile on that kind of activity. Second, isn't that kind of demeaning to you? I assume you have goals and ambitions, and that they are not to be someone who a guy uses whenever he gets the desire? Your life, but boy, I'd think about the relationship.