light pinkish blood

Nicole
Soooo I have been having light pinkish bleeding only when i wipe no pad needed even after intercourse.. it comes and goes.
First time it happened I was cramping and really bad back pain no intercourse oct2nd
Then I came in contact with my husband on the 6th & the 9th after intercourse and bled light pink right after but went away.
Now it's just constant comes and goes with slightly cramping oct 11th & 12th
Last period Sept 12 2016 
2 Weeks after I started having sore breasts still right now 
Can anyone help me figure this out ???