With both my pregnancies I "just knew" over a week before period was due, and everyone was telling me I was imagining it (especially as it was our 1st month trying with ds1 and 2nd month trying with ds2!!) I had *****les in my nipples from 2dpo, and felt nauseated at 4dpo. I was told that was impossible as implantation wouldn't have even happened yet, but there you go.

Good luck!