Hi i been on the depo shot for almost 10 months and i was due for depo shot on june 22 and i get irregular periods and had 2 pregnancy and 1 child and had my child on aug. 20 2014 and have a gallbladder problem and more than 2months ago my hpv come out positive and they said my results where mild and i been having unprotected sex and i feel cramping,dizziness,nauseous,headace,and have brown discharge and uncomfortable sex .can i be pregnant .i went to the clinic yesterday and took a pregnancy test and it came out negative .what can it be ?