Line confusion.

Carmen

Do the lines get steadily darker the closer you get to ovulation? Do they drop immediately back down? How short a time can ovulation last?

Sorry, I know that's a bunch of questions, but I'm confused about those things; especially the first question. I had an IUD for 5 years and it was taken out about three months ago, so I don't really have any data from before then. I have never kept track and I'm 33.