okay...so ive been having sex with my b/f for about 5 mths now, (im 15 and hes 16, been goin out for almost 1yr.) and its always been careful and ive been on the pill for a yr which im rilly carful about.. then we jst kinda started not using condoms about 2weeks ago and hes been pullin out.. :$ i got in my head tht i could be pregnant symptoms like tired frequantly, white like goose bumps arnd my nipples. so we went out and bout a home pregnancy test.. it came back negative.. then took another one once my period was late for 2 days.. and it was negative too.. so ive been rilly confused!! ive read on sites tht its jst my body goin thro changes or am i pregnant??

plz help!!!