3 neg home test & 1 neg blood test

I am confused. My last normal period was Feb. 26-31 it usually last 7 days but that time it only lasted 6 days which I didnt think nothing of it. In March I got my period early and it was irregular, I never had an irregular period before. The whole month since my last normal period I was cramping and getting mood swings, very sleepy, not eating much but gaining weight, and breast pain. I took the first home test and it came out negative. I waited a little longer and took a second one and it also came negative. But I feel it in my heart that I am pregnant so I dont understand. After I had my irregular period I went and took a blood test which came out negative. I stopped worrying about being pregnant until my cousin told me I am gaining weight and believes I am pregnant so I took a third home test and came out negative. I am now waiting for my period this month which should come around the 25th. What should I do?