ovulation 2 days before period

days ago I had visible lines on my pt using 2 brands but suddenly after 2 days using 2 new brands its gone! then I tested again using the previous brand and saw again these faintlines so Im really confused and my ovulation tests also fades. So now that Im 2 days away from my period I dont have PT left and decided to use my ovulation test and saw my lines gets dark.. its really confusing I think need to wait till my period is due then test agaim but if its gone then its again a chemical pregnancy.. what a cycle!