could you get pregnant while usin the depo and condoms?!!

i have been on the depo shot since feb 10 and my partner and i have been usin condoms too,i havent had a period for almost two years now, i didnt have one for four months before i got prego with my first child'[shes fixin to be 10 month now}.however for almost the past month now. i have been "sick" like i was w/ my 1st child. everytime i eat i get sick,& now everytime i see food ill get sick, im goin 2 the bathroom more, my breast have changed as well-the nipples have darken,& even produce a lil{not enough to feed just lubercate} swellin has started in my hands, feet, & face, but every home prego test i take says its neg. i have contacted my doc & she insist on seein me, no test just examine me, she said "it was rare, about as rare as rain & sunshine together." & would you know it the next day it was raining while the sun was shining?! my tummy feels weird again,& even my breast feel different... i dont know if these are side effects{bc ive used the depo before & have never had this before} or if i am expecting again...can anyone help?