dont want a baby but i do

Ik it sounds crazy but i would love start a family but refuse because im only 20 still in college (a junior) and i dont want to be pregnant during our wedding which is in August. But my sister in law having another baby and the first one is only 6 months now, our relationship and finacial situation is honestly more stable then theirs i cant help but be jealous though but i feel dumb for being jealous because its not like i cant have a baby kind of confused rn i think it hurts even more knowing everytime one of his brothers announce a pregnancy he seems a lil down hes been wanting a baby but said hell wait til i ready