My biggest has been twinges in my uterus. I had little pangs on one side and then later the other, since about 5 DPO. This past weekend (10DPO) they started getting more crampy and uncomfortable, almost painful. They don't bother me because it's like my uterus is recognizing that it is pregnant for the first time and saying hello to the baby.
I've had a few dizzy spells. Once when sitting at my desk at work I almost put my head down I was so dizzy. Another time I was reaching up to write something on a poster and I even stumbled a bit I felt so dizzy.
Breasts are slightly sore, nothing more than how they usually get sore with PMS.
I'm torn between wanting to start showing, but then also knowing I am planning on keeping baby a secret from my co-workers for quite a while.