Pleaseeeeee help

I'm on cd 30 and I had a positive opk on cd 14.

Yesterday I had some brown discharge but it didn't turn into a period it just completely disappeared nothing when I wiped myself etc. Then in the evening I had a little bit more brown discharge.

This morning there was nothing when I woke up then a couple of hours later I had a bit of red discharge but no blood clots.

Now this afternoon again it's pretty much disappeared and I've just got some brown discharge on my underwear.

Anyone know if this is implantation bleeding? I haven't had any other symptoms really.

And I thought it couldn't be red blood I thought that was always AF?

Just confused as it just comes and goes!