Most Dr's wont do scans just because You think you are pregnant..... So dont get disapointed if they dont do one.... And even if you are pregnant, at this stage its almost pointless to have one anyways because you probably wont see anything...
Sounds more like PMS to me..... You have to remember that once you decide to start TTC, you focus more on your body and you notice more things then you did when you were not Trying..... Hormones are just a fact of life and yes it really sucks.... "The Joys of Being a Woman"