I just thought I'd post this as I spent a lot of time looking up luteal phase spotting and posted a couple of times about it on these boards.
Basically I came off the pill in August and have been casually ttc ever since (10 months and 11 cycles). I was lucky I went straight back onto a 26 days cycle but more often than not I would have pale milky brown spotting from anywhere between day 18 and day 21 until I got my period. I saw 2 GPS, a private GP and a consultant who all said this wouldnt stop me getting pregnant and I just didn't believe them. Anyway, yesterday was day 27 of my cycle and still no period and I also hadn't had any spotting (not totally unusual as every now and then I had a spot free cycle) but that, coupled with a few symptoms I was having, meant I took a test at 9pm last night (only had a strip test from pound land that came in 3 for £1 packs and it came up as positive quickly!). Drove to sainsburys for some clear blue last night and took them with FMU this morning and positive!
Just so if you're reading this and it's been 11 cycles or you get spotting and it feels helpless it can happen!