Hi ladies need some collective wisdom and advice. We've been TTC#2 for four months now. Last month I had three days of spotting before my period came properly on 31st December. I had LH surge on OPKs on 12th and 13th Jan and we DTD 11th, 12th and 13th.
Yesterday evening I noticed some dark brown blood in underwear before going to bed and I've had some further spotting this morning. If I count from the day of full flow this would have me on CD23/24. Took a pregnancy test and of course it was BNF 
So I'm confused could this be implantation spotting or is it just lead up to AF? Also when should I start counting my cycle days? From beginning or spotting or beginning of actual flow?
Thanks