It sounds like what I had last period too, I have only had my period back for about 4 months and am not ttc but we may have DDT around ovulation time last month, wasn't really paying attention. Anyway, I had the spotting for days pre and post period, but my actual period was only a day of lighter than normal bleeding, then if had some brown spotting later too. No idea why as that is not my normal period at all. I also noticed next to none 'fertile mucous' this cycle, I usually have quite a lot.

So, sorry but no help except to say you aren't alone!! I have no idea what's going on either!!