For the past two weeks i've had headaches, tender breasts, cramps,back pain, fatigue,nausea and have taken two pregnancy tests, which were both negative. also on petogen injection, 7 days late. what

Petogen: Petogen is a progesterone medication used for birth control. Progesterone injections can interfere with ovulation and delay onset of menstruation. Since this kind of birth control is not "100%" certain, get a serum HCG test to make sure about pregnancy. Your symptoms may be related to viral or bacterial infection, so see your gyn physician for an exam and testing.