Need some advice

I have been trying for a couple of months now and I bought the first respons ovulation kits This is my 3rd cycle using them my first cycle using them it was very clear negative an positive test but this cycle I had a negative and than I got a positive and the next day was a negative! But I wasn't sure so I am following the glow app told me this was my week but i used 3 test yesterday first one was positive 2nd test in the afternoon was negative and the last looks like it could be positive today same thing! First one very clear its positive 2nd one negative. I am just confused and stressing :(