My IUD was removed March 4th, had my menstral March 17, and am now 4 days late for the next one. When I took a test in the 9th and it was negative I was pretty bummed. I decided to take one today as a safety precaution since I'm taking my kids (2) for dental X-rays and its positive. It's the digital test which predicts weeks since ovulation and says I should be 4-5 weeks along. It's crazy how fast this happened but I couldn't be happier!!! This app definatetly helped moved things along I'm sure.