Period ?? Spotting ??

Has unprotected sex on the 8 & 12

I am estimated to start my period on Thursday

Yesterday I had ewcm with rust when I wiped and so I thought my period was coming. The rust ewcm turned into slight water brown discharge after an hour or so. Usually when that happens, I'll wake up and my period will be here or it'll get heavier to a normal period but as of now, there's no blood

My period is due on Dec 2

Instead for the remainder of the night it was scanty and this morning, no brown or rust at all

Could this be implantation

Also I've had two kids before and never experienced implantation bleeding

Or could my period just be weird starting