Positive pregnant tests but have my period now

Hi all

The past few days have been an emotional roller coaster. I was a few days late in my period. No signs or symptoms of possibility being pregnant except the test results. I ended up doing so many tests because all of the First Response tests came out positive and all of the Clear Blue ones came out negative. My last period before the one that just started today was on Jan 5. It is definitely a period I have today for sure complete with the cramping and flow I normally have. So what on earth is going on with the positive pregnancy tests despite my having my period today?