Woke up in the middle of the night throwing up my fav food ?

Hello , I woke up this morning at about 3:30 to throw up , and it was my fav food . I luv this food and it juss seems unusual for me to wake up in the middle of the night to throw and and fall right back to sleep after . And after I did I felt completely fine . It's not the flu cuz I feel fine now . Yes Im sexually active and I'm of age , but I don't think I'm pregnant cuz I juss qot off birth control (I only took 1 shot of depo , tried it and hated it so i got off)about a month ago , And they say it takes a while for u to get preggo after u get off birth control..but can I have your opinions please . My boyfriend & I really don't want Any kids right now , but we obviously like every other couple talked about if we did n what well do . Opinions needed plz and thank u .