hi,
you didn't mention whether your periods are regular or not,
in case of regular periods, if you are pregnant by this time you might have got urine
pregnancy test positive.
the other possible causes for your symptoms are,
-hypothamo pituitary axis disturbance due to stress and strain or due to drastic change in weight,
because of this increased
prolactin secretion can occur which might have led to sore breasts.
-spurious pregnancy: thinking continuously about pregnancy and being extreme desirous of pregnancy can lead to symptoms of pregnancy in its absence.
so you consult your gynecologist, get one
ultrasound, estimation of prolactin levels and
hormonal assay for
thyroid hormone which will possibly find out the cause.
take care.