missed period twice but neg results on birth control

Hi i'm 22 and about a month ago I missed my period I thought maybe it was just stress due to I had a stressful week.  But recently I missed again.  I am sexually active with my boyfriend and we don't always use protection, but I never miss a pill.  Ive taken two pregnancy test and they both came out neg, I really dont have any symptoms except lately I have to pee more often.  I am a bit overweight and I dont know exactly how that affects my situation

[AnnieBrooke]

Possibly the pill is to blame.  Check with your doc about a possible lighter hormone dose.