It maybe that you are thinking so much about being pregnant that your making your body feel that you are. I know that sounds weird but, it happens. I have a cousin who wanted to be pregnant so badly, she psychologically made herself pregnant. She had gained weight, her breast had enlarged and she was sick all the time. Well, she was check into the hospital and the doctors had found out that she had a hysterectomy. They had a doctor come and speak with her. She has been going stress with her hair salon, her daughter and in general, she felt disconnected as a mother. Like I said it was a pretty weird situation. I hope this helps. If all else fails, go to the doctor and have them do a blood pregnancy test and then you will know.