Trying to concieve

My depo ran out on December 24th approximately I baby danced on December 28th I know it is unlikely to fall pregnant so soon after stopping the depo but have been having nausea hot flushes I had mild spotting and stomach cramps but only lasted 1 day I have been having brown discharge with cervical mucus in it and normal cervical mucus discharge I wee all the time and am hungry all the time but can't eat because of the nausea I am irratable and have mood swings too could this be because of the withdrawal from the depo or something else I haven't revived af yet either I took a pregnancy test a few days ago but it was negative my nurse at my gp surgery said to retest in a few weeks any advice would be Gratley appreciated