7 days DPO.. symptoms maybe ?

Jessie • 3/13/15 I lost a part of my heart ♡ trying for my rainbow baby♡
Today my breasts have been extremely sore, perhaps worse than normal. One side will hurt worse than the other and it will happen the other way around too. I'm not sure if it's a symptom or not, also I have had a very noticeable increase in CM. Has anyone else experienced this and then got a BFP? Thanks ladies !