i have a boyfriend and we are sexually active and sometimes have unprotected sex. but also Ive been on the pill for 5 years, i take it 3 months straight and then have my period. and my period is always 6-7 days and then when i start taking my active pills it goes away. but this time it was weird i got my period the 2nd day of the non active pills it lasted 2 days and then was gone...but 2 days later i had intercourse and about 30 minutes after, my period came back and i woke up the next day and it was gone. and the past week Ive been feeling nauseous, and my breast are tender. what should i do or what is going on?