Sorry for tmi but I will try to include as much detail 
A few days ago I noticed I was spotting a fair bit, it was never a ridiculous amount so I didn't really worry about it. Until two days ago, I have started to get huge amounts of dark brown discharge (no noticeable smell), about the size of the palm of a hand. I have had spotting in the past but it has never been as bad as this. I also think I might be ovulating at the moment...
I have had period like cramps and on/off Diarrhea and constipation. I am soon to have a blood test for my thyroid so could be related to that? Also 100% sure it is not implantation.
I think that's it, thanks in advance and I appreciate any help