Just trying to see if this is common...

Hi! My husband and I have been TTC for 2 months. I have been experiencing breast tenderness/soreness/swelling, darkened areolas, nausea associated with certain smells (coffee, Parmesan cheese, beer) and have been very tired. The breast tenderness and being kind of tired usually happens a day or 2 before my period, but my period is still 6 days away... it has never happened this early. It has been going on for a little over a week now. I took a pregnancy test today and it was negative. If I miss my period, I will take another test as I have read that sometimes tests don't pick up the hormone early on. I just wanted to see if anyone could give me some insight as to what else may be going on or if anyone else has experienced PMS symptoms like this.
I may schedule an appointment with my gynecologist if it persists much longer. Thanks!