Weird stuff ?

Seriously my weirdest cycle ever 
-Day af was supposed to start I felt very nauseas even threw up 2 times
- af 1 day late boobs grew over night 
-af 4 days late boobs were killing me !
Heavy and full and in so much pain 
- af 7 days late (today) around noon had horrible cramps  when I wiped I had pink blood (not red like usual af)  cramps lasted 3 hours and I am no longer bleeding at all. Can implantation take place after a missed period? Or am I just being hopeful?