Does a missed period along with white discharge, spotting, fatigue and back pain mean pregnancy ?

Hi my period is missed for 12 days.i took two test for pregnancy one test on 30th day,another on 37th day but both are negative.my last period is on apr 22 /2011.now i am having white discharge with little blood spotting.I am soo tried,having headache frequently,backpain on my 13th days i got my period,i am not having severe pain during my period before but now i am having severe pain.on 11th days i had white discharge with little blood spot,also on my 12th days same thing happen.but i feel tried,feel to sleep always.please tell me what s happening in my body,please tell me what i have to do. i want to get pregnant quickly please guide me to get pregnant