worst Feeling Ever

I just don't understand what I am doing wrong. Over 1 year of TTC. Neither of us smoke. Neither of us drink. I haven't been on birth control for almost 2 years. I thought it was going to happen one time. I was 11 days late. I felt nauseous all the time, super tired, and sore breasts and then AF showed up. Periods have been normal since then. Then last week I had my period for maybe 10 hours. Now I have full cramping in my lower abdomen, sore breasts, bits of nausea through out the day, and a bloated stomach. I went and tested and it said negative. I just want to give up on the thought of having kids. Maybe I am just not meant to