uneven breasts??

Hi group!  This is my first month ttc after a miscarriage at the end of march.  According to glow, my period is due today but I don't know how regular my cycle will be because of the miscarriage.  Anyway, my breasts had beeen very swollen for the last few days and today they are very uneven with the left noticeably larger than the right.  I don't remember this being a typical symptom pre-period; I'm wondering if this might be a symptom of pregnancy?  Any thoughts or experiences?