Period smell 13dpo

Kelly
Think I'm 12/13dpo but due on at the weekend. I am convinced that I have symptoms this month:
Slightly tender bbs, heightened sense of smell, light cramps, tiredness, light nausea.
TMI: Can smell a blood smell like I'm coming on today. Anyone else have this and been pregnant? Maybe I'm clutching at straws. 
Not testing as didn't get early BFP the last time when sadly ended in MC and I don't want to feel sad again.