hello, im 15 and i think im pregnant so id like some advice and comments on this.. my and my boyfriend were fooling aruond around june 13th we didnt have sex but i think precum got near or on my vagina ive taken four pregnancy tests and they were all negative but 2 of them i took about a week before i should have gotten my period. the other two...one i took two days after my missed period, the other 6 days my breasts look bigger, feel heavy and are kind of tender i got small cramps on the day i should have gotten my period which was july 2nd ive also had to go to the bathroom around 4-6 times a day what i want to know is, is there a good chance that im pregnant? when should i take another test? please help