Alright my period was supposed to start January 8th. It’s now the 13th, and it’s not here. I took a test the 7th, 8th, 10th, and 12th. All except the 7th were with fmu, and all were negative. I’ve been using the 88¢ tests from Walmart. I’ve heard that they aren’t as sensitive as like the first response even though they say they are on the box. Should I splurge for some first responses or not waste the money? I plan on testing again Monday with the ones I have, but I’m just curious if you ladies have found the difference in sensitivities to be true.