Can i get pregnant again?

well i had a baby on june 16
and then 2-3 weeks sex then got my pired stoped on the july 31 but it didnt last long .it usually last seven days and then that same day i got a shot.and then had sex.and i feel light head . tummy ach dyarhia throwing up and after i eat san upsert tummy , and light brown spotting
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