Im confused someone help

The 22 of DEC I took a test an it came up positive then I wanted to make sure so I waited two days and took another it came up negative. So I have been feeling tried and stuff lately so I woke up this morning took a test at 8:30 am it came up positive so I got really excited then I had a clear blue and that one showed pregnant and I wanted to use that for pictures but it came up negative at 2:30 I'm so confused I had a very light period this month and was only 3 days and not 5¿

Can someone help?