AF came from Dec 25-28 and started using OPK strips on Jan 1. They were faint lines until yesterday and today, when they were a little darker than before. My cycle has always been 24 days, so I should be expecting AF on the 16th, in 8 days. I'm very confused how this works, as I'm new to TTC. Is it possible I could have ovulated immediately after AF or am I suddenly going to have a longer cycle...??? Any experience with this?