I'm getting this post out late as I'm still waiting for a conclusive answer either way. When I ovulated the first time I had a 12 day LP, and based on the cramps I was getting yesterday I expected AF to show up late last night or early this morning. I was surprised to wake up and find out she had postponed her visit. Took an HPT this morning and also tonight and they were both BFN. Did a little research and apparently Clomid can extend your LP by several days. One person mentioned she had a 12 day LP before and then with Clomid had a 17 day LP! So now that's what I'm expecting. If I get AF before then I will be very happy though so I can start my new cycle.
Like I briefly mentioned above my cramps have started already. Yesterday they were painful but I was mostly able to deal with it. Today they feel like AF is already here. I've had to take two of my pain pills and it still kind of hurts. So this is why I'm thinking I'm dealing with an extended LP instead of getting a late BFP. I'll continue testing just in case though. Probably only every other day from now on so I don't use up all my tests.