Cramping but no period

So a couple days before my period was due I started to get sore boobs (this is not one of the symptoms I get before my period) I've been having sore breasts for about 4 days now, I've also been cramping again before my period and now (not painful at all, it's dull and just uncomfortable), weird dreams, serious mood swings and certain smells have been giving me so much trouble. I was due for my period on the 30th of April. I've been doctors they said that I've got to wait a week after this period (what was suppose to be a period) is over. I feel nauseous. But I'm not sure if I'm pregnant or not. Anyone in the same boat? Or has anyone experienced the same thing before?