My last period was supposed to start May 2. There was one day of spotting, which is not normal for me, my periods are usually 4 days long and extremely regular. Since then I have had some nausea, a lot of breast tenderness, a weird metal taste in my mouth, fatigue, difficulty sleeping and mild cramping. I took 2 tests the week I was supposed to have my period and 1 more a week later. They were all negative. I am on the pill, but I already have 2 children, and it feels a lot like when I was pregnant before. Has anyone experienced anything like this before?

It's possible, but could be due to the pill and hormonal changes. See what happens when your next period would be due. If still no period, try another test. Or, if you continue to feel that you are having possible signs of pregnancy, see your doctor about having a blood test.