Last time I conceived I had lots of mucous which sort of gave things away and felt sick and tired all the time.
Now I'm breastfeeding DD (have had one period), have monsterously sore boobs, absolutely exhaustion, and lots of CM when I wipe (sorry if TMI) but not as much CM as last time. I wondered whether the breastfeeding was drying things out a bit.
BTW I can't test for another ten days and it's driving me nuts but I was aware I was pregnant last time within about six hours of conception!