Stressed

My husband and I have been together for four years and have been married for a year and a half. Now that i've graduated from nursing school we have decided that is time to try and have a family. We tried in January. I'm not sure what my exact fertile widow is. My last period was jan 8th and we tried between the 15th and the 24th about 5-6 times.I took a test today and it was negative. My period is due around the 5th to the 7th. I feel like I have some of the symptoms like some mild breat tenderness, mild lower abdominal cramps (almost like menstrual cramps)bloating, I'm emotional, and I felt a little sick one morning, but it passed. I'm really hoping I'm not just psyching myself out because I want this so bad and i'm anxious to find out. I don't know if I'm feeling this way because I want to be pregnant so bad. Am I testing too early? Is it likely I could be pregnant? Are we doing something wrong? Please help!