Positive and negative?

I posted the first one earlier today (Equate Early Signal) and it looks like a faint positive, then I took the First Response Early Result and it’s a big fat negative. According to this app, my period was supposed to start yesterday. The First Response Early Result is supposed to detect hcg levels as low as 6.3, so obviously I’m not pregnant if that one is showing a negative even though the equate is showing a positive :( Anyone else been through this?? Should I give up testing and wait for period?