I got my period 3 times............?

on the 11th of april i got my period it was regular the Again on the 25th i got my period Again then 2 weeks later i got my period Again wtf....im sooo maddddd i was using seasonale the birth control and i stopped using it CUX it made me sick so nOW i was reading online and it said it might be cuz of the birth control and i made an appt for the gyn and its 29th im soo worried i need help cuz im goin crazy need to noe that everything is ook im 17 and this never happend to me before...and like in december the doc told me i had pid and i heard i wasnt goin to be able to have kids can somebody that had pid and got pregnant help me i was tryin to get pregnant for 8 MONTHS and it neva heppend 2 me i noe im 17 and i should wait but im scared.....................helpp