I'm in the same boat as you Razzberry, although I have yet to test. I'm 13 dpo according to FF, and was cramping a fair bit yesterday arvo, and my lower back has been sore for most of yesterday and today. I thought Af would have definitely showed up this morning, and I have been going to the loo non stop today to check, but all I've seen is the tiniest bit of brown spotting. I bought some hpts today, and depending on how my temp is in the morning, and if af is still awol of course, I'll test. Hopefully our little ones are just getting nice and comfy in there, and we'll be rewarded with nice strong Bfps in the next couple of days as it takes a few days after implantation for the hcg to register on hpts.