I have irregular periods so i bought a cheap ovulation kit from Walmart. It had seven tests in it. I started testing 12 days after my period. I didnt get any positives. Im not sure if its me or the tests. Can someone please explain how to use them and what brands i should use? This is our first month ttc, and AF is due in 6 days. I took a test and its negative. I'm going to test when my period is suppose to start. Im new to all this!