Hello my name is Alma Tena, the last time I got my period was Feb 19, 2016. I took a pregnancy test…

Hello my name is Alma Tena, the last time I got my period was Feb 19, 2016. I took a pregnancy test last month and it was negative, this month I did a blood work and it came back negative, and I also took another 2 pregnancy test and both of them came back positive. I bought a different brand and those came back negative. Can you please help me, I'm really confuse. Thank you