implantation bleeding/testing negative

Catrina
So I'm  6 days late now, 
-CD14-I know I ovulated on CD14 I felt a cramp in my left ovary and then spotted light pink.
-CD26- light pink spotting just when I wiped 
-CD29- rusty dark brown blood while doing the deed
-CD36-Absolutely nothing since and now I'm 6 days late. 
-The very first test I took was extremely light but positive, even my fiancé saw it. And asked "is it supposed to be that light?" And all negative since. 
-Of course I want to be pregnant so I'm not going to list all the pregnancy symptoms that could totally be in my head, but my boobs have been sore and swollen for two weeks now. 
👶🏼Is it possible that I am pregnant and it's not showing on a test? Or I was pregnant but implantation wasn't successful? Any opinion is awesome thanks. ❤️