Breast sore and heavy

I have 2 children 6 and 3 yrs old.  My husband had a vasectomy about 7 months ago and now I'm experiencing very sore breast like when I was pregnant before.  I'm also more tired than usual.  My last period was about a wk late and not as long as usual.  I'm not due to start my period for another 2 wks so obviously I can't test yet.  I'm just wondering how likely is it that I could be pregnant.  Any ideas?
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