yes but also as someone else just posted tender breasts can just be a sign of PMS or an impending period.

I rarely get tender breasts but this past period I had VERY tender breasts to the point that even my bra hurt yet my period showed up exactly as scheduled. So its hard to say definately that its going to be a sign for me that tender breasts are a sign of pregancy. Obviously this is anecdotal but it certainly shows the variability.