Hi Laylabud
from me too.
Some women do have the odd period after the 12 month point has elapsed. The time is set at this to be conservative - so that any bleeding after this point is referred to exclude the possibility of endometrial cancer, rather than it being abnormal to still have periods after going 12 months without. I am saying this because you may have another period - the cramps and boobs could be heralding this.
Other than that - I am not sure why one would experience uterine cramps - unless this is due to the fibroids? Ovarian activity does continue even for some years after last period ( but only at a low level) so the minor fluctuations could still possibly cause tender breasts?
A lining of 7 mm is possibly on the high side but as Kathleen said the thickness will vary depending where you were in your cycle. If it was during the last 12 months without a period - then docs will want to make sure it doesn't get any thicker - if you are post-menopausal as this can be a risk for endometrial cancer - so if it is still thick, they may decide to give you something to thin it?
Hope all goes well with the scan anyway - do keep us posted
Hurdity x