im 17 years old and i think i may be preqnant . im exauseted theouqh out the day , im gaininq wait . i sometimes feel like vomitinq . i qet frequent headaches . i have abdominal pains and lower back pains . more back pains then anythinq , and i've noticed when im walkinq around for a lonq time or whatever my lower back starts to hurt more . my joints feel achy at times and i have constant bloatinq . ive also been on birthcontrol but i missed a few pills .could i be preqnant ?