My symptoms started 6 dpo with my last pregnancy. They were very strong symptoms. Very sore breasts as in, I couldn't even brush them with my bra without them hurting. I needed to wear a bra to bed early on because it helped with the pain. The sore breasts were the biggest give away. I also remember saying to dh before I got my positive that I could swear they had got bigger. I am guessing they had as that is how SIL knew I was pregnant.