The symptoms described by you as sore breasts,back pain,abdominal pain are suggestive of pregnancy possibility and if you had unprotected intercourse in the recent past then high chances of conception are present.Some other causes are hormonal fluctuations,underlying uterine or ovarian causes,eating disorder etc.
I would advise you to get a Urine test done for pregnancy determination.Kindly visit a Gynaecologist for evaluation so that the further line of action can be decided.
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