I just had a baby four month ago

I'm so scared because I think I'm pregnant again today I threw up some thick clear stuff ..my period is 9 days late ....I been eating a lot more then usually... And I been very tired and just want to sleep.... My moods have been all over the place.... I really needs some advice ... I'm so nervous because I just had My son October 1 2015 he is only 4 month I don't know if I can handle another baby but adoption and a abortion is out of the question I just don't know what to do