I'm due around the 27th. Started a B50 complex this month and ovulated a couple days earlier (yay!) and I already varied by a day or two, so I don't know exactly when to expect it. It's my 4th month trying, but one of those months was really halfhearted because I was so busy at work, so it's really more like my 3rd.
My breasts are a little sore, but it's too early for that to be a symptom, I think. My lower back is sore, too, but I spent most of the weekend sitting on hard folding chairs and hard ground, so I'm trying not to read into everything. It's hard not to take every little thing as a symptom.