What could this be?! Any wisdom?

[Tryingforourmissingpiece]

I'm hoping that someone might be able to shed some light/share thoughts/own stories on what my crazy body is doing before I phone to book a doctors appointment on Monday...
We have been TTC for about 2 years (miscarriage in August) and whilst my cycle isn't massively regular, I am usually pretty sure my period will arrive after 30- 36 days on average. We had planned to book a doctors appointment if we didn't conceive this month...
Last cycle I got sore boobs 4 days before my 'period', although before the actual period, which was quite painful compared with usual, I had lots of watery discharge, some with brown blood in.
Weirdly, my sore boobs continued after my 'period' this has never happened to me before... I still have sore boobs now, on Cycle day 20.
Yesterday I began spotting a little and today its more like a very light period with slight achy cramps, on off nausea, on off metallic taste, I feel pretty tired...If this is a period, it will be by far the shortest cycle I have ever had.
I've had many negative OPK (I should be ovulating around now/yesterday) and 2 neg pregnancy tests over the last 21 days.
I just want to know what the hell is happening so that I can try to get back on track with TTC...! Feeling so drained right now...

Ring your GP for a blood test perhaps?! I just had the same kind of period as you last week - my sore boobs continued through it! Which never happens 👀 I'm so so tired but don't wanna do a preg test as I'm convinced it was a period... who knows what our bodies are doing 🥲

When did you do your last pregnancy test?

That’s the plan for Monday @xoJellyBean
A couple of days ago @Bundaberg84

When is your AF due? I'm not sure if I read it correctly. You're spotting right now, but according to your cycle you should be around your ovulation date, right? How do you track it?

I use natural cycles and track bbt (although not for the last two days...) my last period started 19th April and lasted 4 days. Going by previous cycles, Natural cycles predicts that I should ovulate around CD19/20 but I am bleeding like the first day of period on CD20... my boobs have been sore since 15th April 😫 period not due for about another 2 weeks roughly...

Are your cycles usually regular, I take it?
It's really weird. I mean it's possible that you just had a really short cycle. But I think I'd get it checked out by a GP as well. Sorry I can't really help you. And things like that have always have to happen on a weekend right?

Thanks @Bundaberg84 Yes, these things always have a habit of happening on a weekend..!