Hi!
AnnieBrooke (above) is
correctCorrect (new formula) that the symptoms you are feeling are caused by the hormone injections that they are giving you. Both
estrogenHormone replacement therapy and progesterone cause breast tenderness. If you transferred day 5
embryosCea, you have a very good chance for success. The pregnancy symptoms caused by the embryos themselves won't being until they implant and start to produce HCG--this coincidentally is exactly the same time that your RE is going to have you take your pregnancy test.
In the meantime, get plenty of rest and take good care of yourself, It is OK to use a little heat on the sore back.
Good luck!
Dr B